Type: Spiral Carbide Drill Bits with 2-Way Cut for Countersink. Made of: Premium Solid Fine Grain Tungsten Carbide - Imported Material. Diameter shank diameter: 3.175mm. Cutting edge diameter: 3.175mm. Cutting length: 22mm. Total length: 40mm . Suitable materials: cutting - Milling on: MDF panels, chipboard, panels with insulation, log fixed to the panels; acrylic, PVC, resin, plastic, chipboard, composite, melamine board; solid wood, wood, plywood, lotus tray; Suitable for : CNC machining cutter, woodworking machine, CNC milling cutter, etc. Features: Combination of upper and lower blades - Sharp ends.< /p> High precision grinding and polishing - Resistance to abrasion and high temperature - Good rigidity - Not easily broken. No burr for up and down spiral machining. Good performance - Improve work efficiency - Reduce cost. Features / Dimensions available: Name: 2 countersink drill bits. Available dimensions (in mm): 3.175 mm. DDC: cutting diameter; LBC: edge length of cut; LT: total length; Contents: Set of 5 pieces. Condition: top quality product.