characteristic: The circular arc design of the blade has the advantages of small cutting resistance, high drilling speed, easy chip removal, neat and smooth holes and no broken edges. Suitable for drilling machine, drilling machine, bench drill, vertical drilling machine, hand-held electric drill, etc. Drill plywood, hardwood, melamine, MDF, drawers, etc. Used for drilling pocket holes, inclined holes, overlapping holes and flat bottom holes. These superhard cemented carbide drills can drill through a variety of materials. describe Name: woodworking drill set Specification: 15mm, 20mm, 25mm, 30mm, 35mm. Material: Metal colour: silver Package Contents: 1 x Woodworking bit set Only the above package content, other products are not included. Note: Light reflection 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.