1pc Metal Drilling Twist Drill Bits HSS 400mm Extra Long Drill Bit 6/7/8/9/10/11/12/13/14mm Extra Long High Speed Cobalt Steel,12mm

The drill bits in the pack is 400mm, which are longer and drill deeper than standard ones. Made of High-speed steel, these twist drill bits are durable, and they have high abrasion resistance&long service life. With the double groove chip removal design, these drill bits can speed up the process of drilling and chip removal.And the round shank is suitable for most types of hand drills and impact drills. Twist drills are formed after quenching, and they meet the industrial tolerance standards for bore diameters. Each bit meets industrial performance and safety standards. Suitable for various materials, such as die steel, spring steel, white steel, ordinary steel, aluminum, copper, wood, stainless steel(within 1-4mm), plastic and PVC,etc. Only one size extra long twist drill is included in each selection, please purchase as needed.