Features:
HSS Countersink Drill Bit Set 1/4" Hex Shank #6 #8 #10 #12 Pilots
Countersink Drill Bit Set w/ Quick Change Hex Shank , Screw Size #6 ,8,10, &12
Countersink Drill Bit Set Quick Change Hex Shank
1/4'' Hex Shank Screw Pilot Countersink
Shank: 1/4 hex shank.
Material: HSS 4241,Black chamfer drill body material is 45 steel
size:
Chamfer    Drill
6#         2.38mm

8#         2.78mm

10#        3.175mm

12#        3.56mm
On the same axis,tighten the screw after screw cap is located below the level of the board
Suitable for drilling or mechanical joints with Chuck,and drilling in hard wood and wood floor

package included:
4pcs Woodworking drill countersink
1pc wrench