3pcs Countersink Drill Bit, Titanium Triangle Conical Countersink Drill Bit, HSS Stainless Steel Metal 4-12/20/32mm, for Screwdriver Drilling in Steel, Brass, Wood, Plastic

General description3pcs Countersink Drill Bit set includes titanium triangle conical countersink drill bits made from high-speed steel (HSS). The set features three drill bits with cutting sizes of 4-12mm, 4-20mm, and 4-32mm, all housed in a nylon bag. These bits are designed for drilling in various materials such as steel, brass, wood, and plastic.Technical specificationsMaterial: High Speed Steel (HSS) with titanium coatingCutting sizes: 4-12mm, 4-20mm, 4-32mmColor: GoldInstallationWhen drilling, inject water to cool the drill bit and prevent overheating.Ensure the workpiece hardness is 25° or less and thickness is under 5mm for optimal performance.Remove debris around the hole before drilling to avoid damage.UsageRecommended speed: 250 to 400 rpm.Avoid reverse rotation when the drill bit is in the hole to prevent it from falling.Always wear eye protection while using the drill bits.Other informationThese drill bits are suitable for reaming, chamfering, deburring, and drilling tasks.