Mayhew Pro 24301 3/8-inch Knurled Center Punch Tool Mayhew Pro 22024 1/2-Inch Line-Up Punch Rust Resistant Available in multiple sizes and sets. The Mayhew 5/32" Point Size Pro Knurled Center Punch (24301) is an essential tool designed for accurately marking or piercing materials before drilling Used for piercing, or marking for starting drills, in metal and other materials It features designed for piercing or marking metal. In addition, it is made of steel, has a black oxide finish, with a knurled grip. This centre punch is... Mayhew's Center Punches are ideal for piercing, or marking for starting drills, in metal and other materials. Buy Knurled Knobs | SKA-12 | Reid Supply Over all length: 4, body size: 3/8, body type: round