3pcs HSS Straight Groove Step Drill Bit Set with Chuck Wrench Converter, 501 Original

3pcs HSS Straight Groove Step Drill Bit Set 3-12 4-12 4-20 4-32 Drill with Quick Release Chuck Wrench Converter Bit Socket Adapter Metal High Speed Steel Woodworking Hole Cutter Cone Pagoda Drilling Power Tools Feature of wrench head:1. Quick release and safety lock design: 1 / 2 inch square female to 1 / 4 inch hexagon female socket adapter2. Use this chuck converter to convert any pneumatic or electric impact wrench into drill bit or ratchet wrench into driver3. Quick release mechanism allows easy one handed exchange between positions during operationFeature of bit:1. 3 HSS step cone bits, titanium coated bits2. Excellent workmanship, firm and durable3. Wide range of application4. This is a new HSS steel cone bit made of high quality HSS steel and coated with titanium to reduce friction and heatSpecification:Material: HSSPackage size: 100 * 70 * 30mmSuitable for cutting holes of steel, brass, wood, plastic and other materialsStem: 6.35mm (1 / 4)Size of small drill:3-12: 10 steps (3mm 4mm 5mm 6mm 7mm 8mm 9mm 10mm 11mm 12mm)4-12: 5 steps (4mm, 6mm, 10mm, 12mm)4-20: 9 steps (4mm 6mm 8mm 12mm 14mm 16mm 18mm20mm)Size of large drill:4-12mm: 5 steps (4mm, 6mm, 8mm, 10mm, 12mm)4-20 mm: 9 steps (4 mm 6 mm 8 mm 12 mm 14 mm 16 mm 18 mm 20 mm)4-32mm: 15 steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm)Note:Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!Please allow 1-3mm measuring deviation due to manual measurement.