1/2" Conical Multi-fluted Brace Style COUNTERSINK Bit & square Shank The product is a 1/2" conical multi-fluted brace style countersink bit with a square shank. This countersink bit is designed for precision cutting and chamfering of metal surfaces, specifically with a 1/2" diameter cutter head. The multi-fluted design and brace style provide efficient and clean cutting, making it a valuable tool for metalworking projects in various industrial settings.