Name: Conical woodworking countersunk bit drill conical countersunk hole drill. Number: D01301 (Long Type) Handle: 1/4" hexagonal handle. Package :Plastic bag package Material: The material of drill bit (conical core) is HSS 4241, and the material of black chamfering equipment is carbon steel. Specifications: No. Corresponding to the diameter of drill bit (drill core) 6#3mm 10#3.5mm 13#4mm 16#4.5mm Function: It can drill the screw hole and the sinking hole for the screw cap at the same time and keep them on the same axis. After the screw is screwed, the screw cap is located below the plane of the plate. Suitable for drilling machines with chucks or joints, suitable for drilling on hard wood and wood layers. Woodworking opener set hexagonal screw hardware tool sinking bit sinking bit drilling cone hole drilling Number: D01302 (Titanium Coated Type) Handle: 1/4" hexagonal handle. Material: Drill Bit High Speed Steel 4241 The material of the chamfering device for the black drill body is 45 # steel. Packing: Plastic bags & amp; nbsp; &; nbsp; 56 grams Specifications: No. Corresponding to the diameter of drill bit (drill core) 6# 2.38mm 8# 2.78mm 10# 3.175mm 12# 3.56mm On the same axis, screw the screw after the screw is located below the board plane! Suitable for drilling with chuck or joint. Name: woodworking hole opener set hex screw hardware tools countersink drill countersink drill taper hole drill Number: D01303 (Short Type) Stem: 1/4" hexagonal handle. Material: Drill Bit High Speed Steel 4241 Black drill chamfer material is 45 steel. Packing: plastic bag Specifications: No. Corresponding to the diameter of drill bit (drill core) 6# 2.38mm 8# 2.78mm 10# 3.175mm 12# 3.56mm On the same axis, screw the screw after the screw is located below the board plane! Suitable for drilling with chuck or joint