The Swenson Heavy Duty Ambidextrous Thumb Safety is a high quality replacement component designed to the strict specifications of your 1911 pistol. Swenson 1911 parts are reliable and withstand the stress of constant use to keep your pistol functioning. Choose Swenson parts when customizing your pistol or replacing worn or broken parts. Part may require fitting to your specific gun. FeaturesIncludes 2 special hammer pins for frames that measure .750 to .765 wide.The hammer pin is also the down stop for the right paddle.Both paddles are machined from solid blocks of heat treated steel and measure .328" wide.No need to relieve your right hand grips for the safety.