toolant Pro Cobalt Countersink Drill Bit- An exceptional choice for Chamfering. Offers exceptional performance specifically for drilling through metal. Titanium Aluminum Nitride Coating - Increases surface hardness to 93HRC with outstanding heat-resistance, so your drill bit cuts fast and stay sharp Industrial Grade Cobalt High-speed Steel - Superior strength, heat resistance, and durability, making it ideal for drilling metal Impact Ready Hex Shank - One-piece built solid 1/4" Hex Shank for quick change 90 Days Warranty - In the event that you are not completely satisfied with your purchase for any reason, please reach out to us, and we will gladly provide a 104% refund or replacement. toolant Noir-Ti countersink drill bit set TiAlN Coated 3/4 1-piece