5Pcs Extra Long High-Speed Steel Drill Bit Set - 2-5mm Auger Drill Bits for Wood, Plastic, Aluminum & Steel - Perfect for DIY Projects, Furniture Making & Metalworking

Specifications Material High-speed steel Type Twist drill bit Diameter 2mm, 3mm, 3.5mm, 4mm, 5mm Length 150mm~160mm Package List 5 x Drill Bits High-quality high-speed steel The special sharpening technology has low notch resistance and improves drilling efficiency Buyer's Note First drill the hole with a normal drill bit, then use an extended drill bit. It will be easy to break if you use the extended drill directly. Don't drive too high. Instructions: Twist drills are cutting tools and are mainly used for metal drilling, so controlling the rotational speed is critical.The recommended speed of this product: 100-800R/MIN, the larger the diameter, the slower the speed requirement.M2 cobalt-containing high-speed steel twist drill hardness HRC64-66 degrees, suitable for <35 degrees metal drilling, can not drill quenched metal.When working with a manual drill, pay attention to adjusting the speed, as the drill bit is easily damaged if the speed is too fast.This product should not be knocked during use, the work must be fixed, and the work swing will break the drill bit during operation.When drilling metals with high hardness and impurities, the speed is slower than that of normal drilling, and the cooling effect is better.When processing products with large thickness, if there is abnormal cutting, please remove the debris in time.