Brownells ''IN-HOLE'' KIT #1 ID-12 95030

Finest quality coil springs, controlled-tension wound for smooth operation without binding under compression. “In-Hole” springs are made to fit inside restricted areas. “IN-HOLE” KITS - 12 Coil Springs; 6 sizes made to function freely inside holes from 3⁄32'' (2.4mm) to 1⁄4'' (4.7mm). 12'' long (30.5cm). Kit # 1, ID-12; Light duty. Kit #2, ID-12; Heavy duty.