All Ed Brown Guide rods are machined from high quality 416 heat-treated stainless steel. Because of their solid steel design, all one-piece guide rods may be cut down to any length for use in shorter slides. One piece guide rods are also ideal for use with bull barrels. Wrench and plug is included with all two-piece guide rods. All Ed Brown plugs are machined from either blue or stainless, top-quality stress-proof steel. Guide rods smooth out the cycling of the pistol, extend the life of the recoil spring, and add weight to the front of the gun, thus reducing muzzle flip and recoil.