Specially Designed - Steel Cutters or Pilot Hole. Drilling and countersinking in one step, will not sag, and drilling can be done quickly and accurately.Quick Position and Chip Removal - 5-tooth countersink, faster removal of sawdust from wood, three-point positioning, not easy to slip, quasi-drilling and fastDetachable and Adjustable - Adjustable depth of the sleeve with a hex wrench, the drilling length can be adjusted with a wrench to remove or adjust set screw.Durable High Carbon Steel - heat treated and tempered carbon steel with titanium coating for superior cutting power. Application - Suitable for use on wood, PVC and plastic panels. Not suitable for glass, iron plates and steel plates.