This 7pcs tapered countersink drill bit set is made of 4241 HSS and 45#steel with excellent workmanship and durability.It can be installed on drilling machinery with clamp or joint, suitable for drilling on hard wood.7 specifications(5#,6#,7#,8#,9#,10#,12#)meet your different working demands.

Features:
4241 HSS and 45# steel material.
Durable and excellent workmanship.
Fit for drilling machinery with clamp or joint.
7 kinds of specifications(5#,6#,7#,8#,9#,10#,12#), meeting your different demands.
Twist screws on the same axis, and screw nut below the board plane, drill collars can adjust up and down!
Suitable for drilling in the hard wood and wood floor.

Specifications:
Material: 4241 HSS + 45# Steel
Color: Silver + Black
Hex Key: 2.5mm diameter
Drill Quantity: 7pcs Width(mm) Length(mm) The Corresponding Bit Size(mm) Chamfer Size(mm)
5# 16 82 1/8"(3.18mm) 9.5mm
6# 15 80 9/64"(3.58mm) 9.5mm
7# 12 86 5/32"(3.97mm) 9.5mm
8# 16 87 11/64"(4.37mm) 9.5mm
9# 15 91 3/16"(4.76mm) 9.5mm
10# 17 93 13/64"(5.15mm) 12.5mm
12# 16 100 7/32"(5.56mm) 12.5mm
Package Size: 17 * 12 * 3cm / 6.7 * 4.7 * 1.2in
Package Weight:288g / 10.16oz

Package List:
1 * 7pcs Carpenter Countersink Drill Set
1 * Hex Key