Tap Dice Set, 20 pcs, 20 pcs, Kit, Screw Hole, Thread, Screw Cutter, Bolt Nut, Correction Correction Correction Screws [Includes] Tap Dice, 9 pcs, M3X0.5, M4X0.7, M5X0.8, M6X1.0, M7X1.0, M8X1.25, M10X10X10X10 .5 M1 2 x 1.75 Handles. Material: HSS steel (high-speed alloy tool steel). Hardness: 58-62 HRC. Tap and dice set for repairing screw holes, bolts, and nuts. Helpful helper with screw grooves, fix thread threads, and screw trouble