82 Degree Countersink With Adjustable Drill Bit Depth Stop And No-Thrust Ball Bearing. 82 Degree Countersink set with Adjustable Drill Bit Depth Stop and No-Thrust Ball Bearing. The heavy-duty, revolving depth-stop and strong thrust ball bearing allow for quick and easy adjustment of the countersink depth without scratching or burning surfaces. The wood drill bit set is the ideal tool set for every woodworker. Special carbide-tipped drill bits made for long-lasting cutting edge performance and tool life. Excellent For Cutting Natural Woods, Man-Made Boards, MDF, Chipboard, Plywood, AluminumNon-Ferrous, Aluminum Composite Material ACM, Composite Decking Materials, High Density Polyethylene HDPE.