Made of steel, it has excellent performance and is easy to use, and can serve you well. Can be used in high temperature drilling applications. Suitable for bench drill, hand drill and conventional electric drill. Perfect for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber etc. Features -Color: As Shown. -Material: Steel. -Size: About 12.00X2.00X2.00cm/4.72X0.79X0.79in. - Bit Specification Size: 10/8/7/6/5/4/3/3mm. -Plug Specification Size: 6/10/13/16mm. - Manufactured with steel material, high hardness, offer cutting power and durability. - The countersink drill bit tool is simple and delicate, excellent and reliable, carefully crafted, not easy to deform. - The bit adopts five-edged design will fast discharge chips from the on both sides automatically. - Durable, precision production, smooth surface, suitable for bench, speeds not too fast, otherwise will smoke, charred. - It is simple , but it's practical to use, multi-specification, easily meet your different needs. Package list: 8 x bits 8 x plug cutters 1 x wrench