SST+ Drill bit sets Packaged in sturdy metal index containers or shock resistant, extra-thick polyethylene carrying caseDrill bit sizes are clearly marked on inside panels for easy identification and selectionMetal panels are hinged and neatly folded into box. Product Information Brand WALTER Part # 01E606 Flute Length Various Kit 1/16 Inch - 1/2 Inch by 32nds Length Various Origin Country CN Product Type Drill Sets Shank Various Size 1/16 Inch - 1/2 Inch (by 32nds) Product InformationMade with premium grade cobalt HSS to drill harder materials Cobalt drills can drill approximately 30% faster than HSS drills Self centering 135 degree split-point for reduced thrust requirements and minimized walking Special bronze SST surface treatmeSuggested ApplicationDrilling holes in high strength materials Heavy-duty drilling Drilling with fixed spindle machines like CNC mills and drill presses