This Ncstar Universal pistol front and rear sight pusher tool is for removal-installation and adjustment of the front and rear handgun sights like Glock and most others. The sight tool-universal handgun sight pusher tool works with most semi-auto pistol handgun slides and comes with two separate sight pusher blocks, each pusher is specifically designed for either front or rear dovetail sights. The Pusher blocks are made from tool steel. The Base platform is adjustable for height to properly align your sights at the proper height for the sight pusher blocks. The adjustable side and top clamps secure the slide in place. Side witness windows on both sides of the tool frame to check for the proper sight and pusher block alignment. Sight tool frame can be bolted to, clamped onto a work surface, or clamped onto a vice. Heavy duty blue Anodized aluminum frame. Sight pusher steel screws have brass bushings for good bearing surface characteristics and excellent strength.