1. Made of high and high hardness HSS material, high hardness, fast cutting, good impact resistance. 2. 12 pieces tap drills include 6 pcs and 6 pcs metric in all sizes can your different need. 3. Included hex adapter allows you to switch between different sizes easily, work efficiency. 4. Suitable for drilling, tapping, cutting on wood, PVC, plastic, aluminum, copper and metal etc 5. Compatible with electric hand drill, impact drill, bench drill,electric screwdriver and other tap machine. Type: Hex Tool Flute Type: 1/4 inch Hex : 6x13x60mm/0.24x0.51x2.16inch Size: 6-32NC, 8-32NC, 10-24NC, 10-32NC, 12-24NC, 1/4-20NC Metric Size: x 0.5, x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5 Colour:gold Material: HSS Contents: 6 x Drill and Tap 6 x Metric Drill and Tap 1 x 1/4inch Hex Quick Change Adapter Note: The packaging color is random, 't accept the specified color Only the above content, other are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.