1. Made of high quality and high hardness HSS material, high toughness, cutting, good impact resistance. 2. 24pcs tap drills include 12pcs SAE and 12pcs metric in all popular sizes can meet your different needs. 3. The included hex shank adapter allows you to easily switch between different sizes and improve work efficiency. 4. Suitable for drilling, tapping, cutting on wood, PVC, plastic, aluminum, copper and sheet metal, etc. 5. Compatible with electric hand drill, impact drill, bench drill, electric screwdriver and other tapping machine. Shank Type: Hex Tool Flute Type: Spiral 1/4 inch Hex Shank: 6x13x60mm/0.24x0.51x2.16 inch 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 Color: Gold Material: HSS Package Content: 12 x SAE Drill and Tap Bits 12 x Metric Drill and Tap Bits 2 x 1/4 Inch Hex Shank Change Adapter Note: The package color is random, don't accept the specified color Only the above