Specification 1/2" (12.7mm) cutting diameter; 1/4" (6.35mm) shank; cutting depth 0.47" (11.9mm), 0.79" (20mm), 0.98" (25mm). A set of 3 straight double edged drill bits designed for 1/4" countersunk holes. Carbide TipCarbide tip is sharp and high hardness which may leave a good smooth edge. Provides you with stable rotation and fast operation, ideal for CNC routers, desktop stands or portable devices. PTFE COATEDThe 1/4 top bearing woodworking router bit with PTFE coating is very heat resistant. It also effectively prevents the accumulation of wood chips, resin and asphalt, thus improving the performance and life of the tool. TIPS 1. Always choose a tool with a cutting edge longer than the workpiece. For example, when milling a 1/2 inch deep pocket, use a tool with a 1 inch cutting edge. 2. Flying sawdust will hurt the eyes Widely usedThe main function of 1/4 shank straight cutter is cutting, three-dimensional clearance angle, slotting. Not only is it suitable for cutting all composite materials: MDF, solid wood, particle board, plywood, etc., but it is also ideal for cleaning grooves.