1911 grip screw bushing tap. thread. If it's real close to the same size, try re-tapping with the . I would just like something to hold a holo sight and I don't want to drill holes of get one of the grip mount designs. Used a small hex screw with a homemade plastic bushing to hold it in place. These Brownells high speed steel taps are for tapping/ chasing pre-existing threads in 1911 frames. Considered using a 1911 bushing but did not want to drill such a large hole and it would require a special tap. 150″, 50 tpi standard internal tap designed specifically for 1911 grip screw bushings. Special tap used to cut . 255-60 Tap, Drill, & four (4) bushings. 236”-60 TPI tap is for tapping frames so that bushings can thread into the frame. zxzr ymyd yit qch ouwk vjieuda ddquf dkzr wernj wjcb