Dial in your chambering work with confidence using the Reamer Handle THR12 – Clymer Rifle T-Handle. Built specifically for professional barrel and chamber work, this rugged T-handle gives you the leverage, control, and precision you need when running chamber and throating reamers by hand. Made in the USA from M-7 high-speed steel, it’s engineered to deliver a lifetime of dependable service in any serious gunsmithing shop. Brownells UK+1
Clymer Rifle T-Handle – Model THR12
The THR12 is listed by Clymer and major distributors simply as the “Clymer Rifle T-Handle”, part of their barrel and chambering accessory line. Brownells UK+1
It’s designed to drive rifle-size chamber and throater reamers with a solid, positive feel that’s hard to achieve with generic handles or improvised tools.
M-7 High-Speed Steel Construction – Built to Last
Unlike light-duty shop handles, the THR12 is machined from M-7 high-speed steel, the same class of tool steel used for premium cutting tools. Brownells’ European listings emphasize that these Clymer handles are made from “M-7 High-Speed Steel of the highest quality” and are precision tools for professional gunsmiths, intended to give lifetime service when properly cared for. Brownells UK+2Brownells Sverige+2
Key advantages of M-7 HSS:
High strength and toughness under the twisting loads of hand reaming
Excellent wear resistance, even with repeated use and contact with oil, chips, and steel reamers
Dimensional stability so the drive surfaces stay snug and accurate over years of work
If you’re investing in a core piece of chambering tooling, this material choice is exactly what you want.
T-Handle Design for Control, Feel & Leverage
The THR12 is a T-handle style reamer handle, designed to sit comfortably in both hands and give you fine torque control as you cut. This format is preferred by many gunsmiths for chambering and throating because it provides: Brownells UK+2Brownells Sverige+2
Balanced leverage on both sides of the tool, reducing the tendency to cant or twist off-axis
A positive, tactile feel for chip load and cutting resistance as the reamer advances
Enough length and reach to work around barreled actions, vises, and fixtures
A simple, intuitive grip that’s easy to use with gloves or oily hands
The T-handle form factor is especially helpful when you’re finish-reaming and need to feel exactly what the tool is doing in the chamber.
Precision Fit for Clymer & Compatible Reamers
Clymer has specialized in firearms tooling since 1958 and is well known for its chamber reamers and headspace gauges. Clymer Tool Their reamer handles, including the THR12, are dimensioned to interface cleanly with Clymer reamers and many other industry-standard shanks, giving you: Brownells UK+2Brownells Sverige+2
Tight, wobble-free engagement with the reamer drive end
Better axial alignment between reamer and bore
Reduced risk of chatter caused by sloppy connections
That precision fit is a big part of why these handles are widely used by professional gunsmiths for barrel installs, caliber conversions, and throat work.
Made in the USA & Fully Guaranteed
Clymer and Brownells highlight that both the Rifle T-Handle (THR12) and the 12" extension handles are made in the USA and fully guaranteed, reflecting the company’s long-standing reputation for serious, professional tools. Primary Tactical+3Brownells UK+3Brownells Sverige+3
What that means in practice:
You’re using a tool from a dedicated firearms tooling maker, not a generic shop accessory
With proper care (cleaning, oiling, and storage), it’s intended to provide decades of use
It matches the quality level of Clymer’s chamber reamers and headspace gauges, which are widely regarded as industry standards
For a gunsmithing bench that revolves around reliable, repeatable results, that guarantee and heritage matter.
Ideal Applications for the THR12 Reamer Handle
The Reamer Handle THR12 is a natural fit in any shop where barrel work is part of the routine, including: Primary Tactical+1
Chambering new rifle barrels with Clymer or compatible reamers
Throating operations to fine-tune freebore and leade for specific bullets
Finish reaming to bring headspace into final spec
General barrel and chamber maintenance requiring controlled hand reaming
Whether you’re a full-time gunsmith or a serious hobbyist, it’s the kind of handle you buy once and keep at arm’s reach for every precision chambering job.
Key Features – Reamer Handle THR12 (Clymer Rifle T-Handle)
Summarizing the most important points from Clymer and distributor specs: Primary Tactical+3Brownells UK+3Brownells Sverige+3
Product Name: Reamer Handle – Rifle T-Handle
Manufacturer: Clymer
Model / Mfr. No.: THR12
Type: Rifle T-Handle reamer handle
Material: M-7 high-speed steel
Intended Use: Driving rifle-size chamber and throating reamers by hand
Design: T-handle for balanced leverage and fine torque control
Origin: Made in the USA
Durability: Precision tool designed for lifetime service with proper care
Guarantee: Fully guaranteed by Clymer
If you’re outfitting a bench for serious barrel and chamber work, the Reamer Handle THR12 Clymer Rifle T-Handle is a professional-grade tool that delivers the feel, strength, and precision your reamers deserve.
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