The Spyderco Endura 4 C10SBK 3.75" Folding Clip Point Serrated Knife (UPC 716104000968) is a full-size, lightweight locking folder built around a fully serrated VG-10 stainless steel blade and a black, textured FRN (fiberglass-reinforced nylon) handle. As part of Spyderco’s Endura 4 Lightweight series, this model combines a 3.75" SpyderEdge blade, a back lock mechanism, skeletonized stainless liners, and a four-position pocket clip in a design intended for everyday carry, utility use, and cutting tasks involving tough or fibrous materials. KnifeCenter.com+2Cutlery Shoppe+2
Model Identification and Platform
This knife is commonly listed under the following identifiers in catalogs and inventories:
Brand: Spyderco
Series: Endura 4 Lightweight
Model name: Endura 4 Serrated, Black FRN
Model / SKU: C10SBK
UPC: 716104000968 KnifeCenter.com+2Botach+2
The Endura line dates back to the late 1980s as one of the first lightweight, clip-carry folding knives, and the current Endura 4 generation incorporates updated ergonomics, bi-directional handle texturing, and internal liners while retaining the core lockback architecture. Target Knives+2BladeOps+2
Blade Design, Steel, and Serrated Edge
The C10SBK uses a 3.75" (96 mm) fully serrated clip/modified drop point blade made from VG-10 stainless steel:
Spyderco’s SpyderEdge serrations are designed to increase effective cutting edge length relative to a straight edge and excel at cutting rope, webbing, cardboard, and other fibrous or abrasive materials. gpknives.com+1
The blade is opened via Spyderco’s trademark Round Hole (approx. 0.5" / 13 mm diameter), allowing ambidextrous one-hand opening without separate thumb studs. Cutlery Shoppe+2Concealed Carry Gear Store+2
Locking Mechanism and Internal Construction
This Endura 4 uses a back lock (lockback) mechanism:
Lock type: Back lock with a rocker bar engaging the blade tang. Willey Knives+2KnifeCenter.com+2
Many Endura 4 variants, including the C10SBK, incorporate a Boye Dent in the lock bar to help reduce the chance of accidental lock release when gripping the knife tightly. Knives Plus+1
Internally, the knife features:
This combination of a lockback design, steel liners, and low-friction pivot hardware is intended to provide consistent, repeatable lockup and controlled blade deployment in daily use.
Handle Material, Ergonomics, and Grip
The handle of the C10SBK is constructed from black FRN (fiberglass-reinforced nylon):
Spyderco molds a bi-directional texturing pattern into the FRN scales. This pattern uses opposing ramped textures oriented front and back to enhance grip traction in both forward and reverse pulling directions, improving control in wet or gloved conditions. Palmetto State Armory+2gpknives.com+2
The handle shape includes:
A pronounced index-finger choil area on the front of the grip
Gentle palm swell and rear taper for comfort
An integral lanyard hole at the butt for attaching a cord or fob National Knives+2Knives Plus+2
Pocket Clip and Carry Configuration
The Endura 4 C10SBK comes with a four-position stainless steel pocket clip, making the knife fully ambidextrous in carry:
This configuration allows the user to set up the knife for their preferred deployment method and pocket orientation, as well as to mirror the setup for left-handed users.
Dimensions, Weight, and Overall Form Factor
Collected specifications from multiple distributors give the following approximate dimensions: Willey Knives+3KnifeCenter.com+3Oso Grande Knives+3
Overall open length: 8.75"–8.78" (approx. 222 mm)
Closed length: 5.00" (127 mm)
Blade length: 3.75" (96 mm)
Cutting edge length: ~3.44–3.45" (88 mm)
Blade thickness: 0.125–0.13" (about 3 mm)
Handle thickness: approx. 0.45"
Weight: approx. 3.6 oz (about 103 g)
These figures place the Endura 4 C10SBK in the full-size EDC / utility folder category, offering a long cutting edge in a relatively slim and lightweight package.
Opening Mechanism and User Interface
The blade deploys manually via the trademark Spyderco Round Hole, with the following user-interface characteristics:
Opening method: Manual, one-hand opening using the 0.5" (13 mm) Round Hole Cutlery Shoppe+2Concealed Carry Gear Store+2
Pivot: Phosphor bronze washers at the pivot to promote smooth action. GrabAGun+1
Lock closure: Ambidextrous back lock, released by pressing the lock bar on the spine of the handle.
This setup supports left- and right-handed operation with minimal adjustment, especially when combined with the four-position clip.
Use Case and Application Context
With its fully serrated VG-10 blade, the C10SBK Endura 4 is optimized for cutting tasks that demand aggressive slicing:
Utility / EDC: Everyday cutting of rope, cordage, packaging materials, plastic strapping, and other fibrous media. gpknives.com+1
Outdoor and work environments: The corrosion resistance of VG-10 and the textured FRN handle make it suitable for general outdoor carry, marine-adjacent use, or jobsite tasks where a robust, low-maintenance tool is required. Willey Knives+2GrabAGun+2
Emergency or rescue-adjacent roles: The SpyderEdge pattern can be advantageous where quick cutting of webbing or textiles may be needed, although this knife is a general-purpose tool rather than a dedicated rescue cutter.
The flat, slim profile and 3.6 oz weight make it relatively easy to carry in a pocket throughout the day without excessive bulk. KnifeCenter.com+2Willey Knives+2
Origin and Manufacturing
Multiple sources confirm that the Spyderco Endura 4 C10SBK is manufactured in Japan, using VG-10 steel from Seki City and FRN handle components molded to Spyderco’s specifications. Botach+3Willey Knives+3Cutlery Shoppe+3
Technical Specification Summary
Spyderco Endura 4 C10SBK 3.75" Folding Clip Point Serrated Knife
Brand: Spyderco
Series: Endura 4 Lightweight
Model: C10SBK
UPC: 716104000968 KnifeCenter.com+2Botach+2
Blade:
Length: 3.75" (96 mm)
Cutting edge: ~3.44–3.45" (88 mm)
Thickness: ~0.125" (3 mm)
Steel: VG-10 stainless
Style: Fully serrated SpyderEdge, modified drop/clip point
Finish: Satin
Grind: Saber / high flat grind National Knives+2Oso Grande Knives+2
Handle:
Material: Black FRN (fiberglass-reinforced nylon) with bi-directional texturing
Closed length: 5.0" (127 mm)
Thickness: ~0.45"
Skeletonized stainless steel liners
Lanyard hole
Lock mechanism: Back lock with Boye-style dent Knives Plus+2BladeOps+2
Carry:
Opening: Manual, one-hand Round Hole opener with phosphor bronze pivot washers Cutlery Shoppe+2GrabAGun+2
Country of origin: Japan
By combining a fully serrated 3.75" VG-10 stainless blade, a lockback mechanism with steel liners, a bi-directionally textured black FRN handle, and a four-position pocket clip, the Spyderco Endura 4 C10SBK 3.75" Folding Clip Point Serrated Knife provides a technical, full-size folding knife solution suited to users who require aggressive cutting performance, low maintenance, and ambidextrous carry options in an everyday-carry format.
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