Atoplee 3pcs 13mm 16mm 19mm 90&deg; Countersink Bits 5 edge Chamfer for Wood Board, Plastic Plate, Electric Hand Drill,Bench Drill Material: Titanium High-carbon steel;Shank type: hex shank Item color: brass tone+silver tone Flute quantity: 5 flutes;Shank diameter: 1/4"(6.35mm) Head diameter:13mm,16mm,19mm; Length:46mm,46mm,48mm Package Included:3pcs HSS 5 Flute 90 Hex Shank Drilling Chamfering