Yakamoz 6pcs SAE HSS Combination Drill and Tap Bit with 1/4 Inch Hex ShankDescription:- 100% Brand new and high quality.- Back tapered beyond tap to prevent thread damage from over-drilling- Deburr/countersink also provided on bit beyond back taper- Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve woking efficiency.- Suitable for drilling, tapping, cutting on wood, plank, plastic, aluminium plate or sheet iron (thickness of less than 3mm). - Made from hardened high-speed steel vs carbon steel for longer lifeSpecification:◆ SAE Size: 6-32NC (3.5mm), 8-32NC(4.2mm), 10-32NC(5mm), 10-24NC (5mm), 12-24NC(5.7mm), 1/4-20NC(6.35mm)◆ Shank: 1/4 Inch Hex Shank◆ Material: Material: High speed steelPackage Included: 6pcs Drill Tap Countersink SetPlease Note: When you use this drill bits, the material temperature will get very high, please add some water or coolant to avoid the material get smoke when using it.