Finest quality coil springs, controlled-tension wound for smooth operation without binding under compression. “Over-Pin” springs are designed to function over gun pins and plungers. “OVER-PIN” MASTER KIT - Combines Kit #1 OD-12 and Kit #2 OD-12 for a total of 14 Coil springs for over-pin use. SPECS: High tensile spring wire. 12' (30.5cm) long.