Product descriptions: Color: Gold Type: Hex Tool Flute Type: Spiral 1/4 inch Hex : 6x13x60mm/0.24x0.51x2.16inch SAE Size: 6-32NC, 8-32NC, 10-24NC, 10-32NC, 12-24NC, 1/4-20NC Metric Size: M3 x 0.5, x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5 Material: HSS Fitment: 1. Made of high quality and high hardness HSS material, high hardness, fast cutting, good impact resistance. 2. 12 pieces tap drills include 6 pcs SAE and 6 pcs metric in all popular sizes can meet your different need. 3. Included hex adapter allows you to switch between different sizes , improve work efficiency. 4. Suitable for drilling, tapping, cutting on wood, PVC, plastic, aluminum, copper and metal sheet etc 5. Compatible with electric hand drill, impact drill, bench drill,electric screwdriver and other tap machine. Package included: 6 x SAE Drill and Tap Bits 6 x Metric Drill and Tap Bits 1 x 1/4inch Hex Quick Change Adapter