Solid Carbide CountersinksPremium Quality Carbide, Cobalt HSS and HSS Countersinks.100% CNC groundMADE IN USANearly, 1,400 sizes and styles in stock and ready to shipSets are available HSSZero Flute Single Flute 3 Flute 4 Flute 6 Flute Combined Drill and CountersinkCobalt HSS (M42)Zero Flute Single Flute 3 Flute 6 FluteCarbide1 Flute 3 Flute 4 Flute 6 Flute Combined Drill and Countersink Search Countersinks