DescriptionType : Hand Tool PartsDescription:HRC89 M3-M10 Combination Drill Tap Bit Set TiAlN Coated Deburr Countersink Bits Uses HSS-Co material, hardness up to HRC89, more durable,can be used for drilling the steel plate even the 2-4mm 304 steel plate. Industrial Grade TiALN Coating,TiAlN coating surface will form Al2O3 which form a hard protective layer when drilling. (Perfect for high speed drilling) Service life is 5-10 times longer than general tap drill. (Can drilling without coolant, with coolant, service life will be longer and performance will be better.) 118 X Bit Design, you can drill from any angle, no slipping.Specifications:Type: Tap Drill Bit Material: HSS-Co Shank: 1/4" (6.35mm) hex shank Surface Treatment: TiAlN Coated DIY Supplies: Metalworking Size: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5Package Included:1 x Tap Drill BitDear buyers, we appreciate your business, if you are satisfied with our service,please leave us a positive feedback and rate the details of the transaction (Detailed Seller Ratings) with a"PERFECT 5 STARS".If you have any problems, broken, quality problems, please don't worry, and don't leave bad feedback.Please send us an email first, we will reply you as soon as possible, please allow us to respond within 12 hours.We understand your mood, and will provide you with the best solution for your problem,please give us the opportunity to solve the problem,For any case,please feel free to come to us,we are always here.look forward to and thank you for your trust.