Description of Countersink Carpentry Countersunk Woodworking Counterbore
5 sizes: 0.11'',0.12'', 0.125'', 0.138, 0.157''. Chunk Size: 0.31'' (8mm) -0.39''(10mm). High Quality Material: Carbide Countersink Drill Bit Set, High precision, smooth cutting edge, Easy to drill and sink. 2-in-1 function: The Countersink Drill Bits Set can save your working time and improve efficiency, because drilling and countersinking work in one step. Adjustable Counterbore: Adjustable length of the lower head, with fixing screw, use the attached Hex Key, remove the screw and set the length of the counter bore. Great Gift: Good woodworking present for Professional Use and DIY Homeowner. Note - Keep the drill bit vertical during operation. This depth only needs to sink the screw head below the surface.