Grips fit Colt Government (5" barrel) and Commander (4.25" barrel) 1911s and all clones which follow the standard 1911 specs and use standard 1911 magazines (usually 7 or 8 rounds). The distance between the screw holes, center-to-center is approximately 3 inches. These grips DO NOT feature the recessed cut into the back of the right side grip panel.To determine if you need this cut, just check the backside of your current grips. This cut is now optional, just type "Ambi Safety Cut" in the note to seller section when you make your purchase.For more info Google "1911 Ambi Safety Cut" Installation Instructions and Use: Start with the guide rod installed in the slide. Insert spring, then insert spring cap. Depress the spring cap, insert comp. Twist to lock into place.