Full-length, hardened steel guide rods help prevent spring bind and improves cycling. Lets you keep your factory, captive, recoil assembly intact and use Wolff recoil springs. Machined from solid steel, polished, then hardened. Fits Glock 17/22/24/34/35. Some of the best production shooters in the world use this rod teamed with a Wolff 14# recoil spring.