Tap & DieChina 6 PCS 1/4" HSS Spiral Hex Shank Combination Drill Screw Tap Bit Set (M3-M10) with Automatic Spring Loaded Center Punch Tool, Find details about China Drill Bits, Rock Drill from 6 PCS 1/4" HSS Spiral Hex Shank Combination Drill Screw Tap Bit Set (M3-M10) with Automatic Spring Loaded Center Punch Tool