Description: Set: Titanium coated counter bit set, 5-piece set included bits for drilling pilot holes of screw sizes #5, #6, #8, #10, #12. Standard 1/4" round shank is quick change compatible. High-Quality Material: The drill bit is made of high-speed steel 4241, and the black chamfer is steel 45. Adjustable Depth: Adjustable counter sleeve depth, drill and countersunk holes for wood screws, no need to change drill bits. You can adjust the drilling length for different length screws by simply loosening and tightening the set screw. Easy To Use: Pre-drilled and countersunk are used to drive the screw flush with the material surface or deep hole counter drilling to drive the screw head below the surface. Broad Utility: Allows for application on wood, plastic, soft metal, fibreboard, particle board, plywood, aluminium board, etc. Note: Actual product color may vary from the colour you see on your screen. Specification: Type: Countersink drill bits Size: 4.5 cm, 5.5cm, 6cm, 6.5cm, 7cm Material: HSS Color: Black Weight: 75gm Features: High quality Adjustable depth Lightweight High hardness Durable Easy drilling High accuracy and less burrs Long service life Easy to use Broad utility Package Content: 1x Hex wrench 5x Countersink drill bits