DB-C2 4pcs Carpentry Countersink Drill Bit Set

Specification:
Material: HSS Drill 4241
Black chamfer drill body material: steel 45   
Shank: 2.5mm dia Hex Shank
Dimension:

Features:
Function: can drill the screw holes and keep on the same axis,after screw in screw, nut below the board!
Apply to with a clamp or joint drilling machine, suitable for drilling in the hard wood and wood  
floor, machine screw for wood screws.
Used  for carpenters, cabinet , furniture makers and other woodworking trades.