The Lyman X-Block is the right tool for anyone driving pins out of firearms. It has all the features to get the job done smoothly and professionally. The X-Block has both a "V" slot and a rounded slot running across the face of the block to support a variety of barrels and slides. The block is made of a tough, non-marring, polymer. The block has multiple holes to take on most any project, as well as a molded in magnet on the back side of the block to catch pins and other small parts as they drop out. Its large 5" diameter provides a stable base with plenty of support. Having the right tool for the job makes any gunsmithing project so much easier! Without the right tool, you may damage fine finishes or break parts. FeaturesLarge 5" diameterMagnet molded into base to catch pins or small partsMade of tough, non-marring polymer"V" slot and rounded slot run across the block face to fit most every need such as pistol barrels, slides and frames