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 shank adapter allows you to switch between different sizes easily, 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. Shank Type: Hex Tool Flute Type: Spiral 1/4 inch Hex Shank: 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, M4 x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5 Colour:gold Material: HSS Package Contents: 24 x SAE Drill and Tap Bits 24 x Metric Drill and Tap Bits 4 x 1/4inch Hex Shank Quick Change Adapter Note: The packaging color is random, don't accept the specified color Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.