Unlike other screwdriver suppliers, Wheeler's engineers measured the screws on over one hundred modern and antique firearms to make sure that we offered bits for every situation. Whether you are working on a Browning®; Superposed, a Remington®; 700, a Smith & Wesson®; revolver or a Colt®; single action, you will find that there is a bit to fit every screw on your gun. The 89 piece set includes 15 ingenious"specialty bits". These bits are great for installing scope bases, getting you out of a pinch by providing a small pin punch when you really need it and keeping once-in-a-while lifesaver tools at your fingertips.