Cut Quickly and Easily in Soft Metal, Wood, Rubber, Plastic and Other Machinable Materials Use on wood, most metals, plastic and other materials carpentry, locksmiths, automotive, metal working Perfectly centered holes every time properly seated screw heads This high speed countersink has a 5 flute rose pattern for chatter free countersinking on steel, brass, aluminum, plastic, wood, and other materials. It is made of 45steel with five flutes. Color: Silver Gray Size: Shank diameter: 6.35mm Specifications: 1/2 3/8 1/2 5/8 1/2 Material: 45 Steel pc Heavy Duty Industrial Countersink Drill BIT Tool SET Woodworking Professional Tools Package Contents: 5 x 5 Flutes Countersink Drill Bit Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.