Features: *[200MM & HIGH QUALITY MATERIAL]which are longer and drill deeper than standard ones. Made of High-speed steel, these drill bits are , and they have high abrasion resistance&long service life. *[DOUBLE-GROOVE DRILL&ROUND SHANK]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 drills. *[EXQUISITE CRAFT] drills are formed after quenching, and they meet the industrial tolerance standards for bore diameters. Each bit meets industrial performance and safety standards. *[WIDE APPLICATION]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. Specifications: Length of each drill bit:200mm Material: High-speed steel Diameter of drill bits*Length: 2*200mm,2.5*200mm,3*200mm,3.5*200mm,4*200mm, 4.5*200mm,5*200mm,5.2*200mm,5.5*200mm,6*200mm ,6.5*200mm,7*200mm,7.5*200mm,8*200mm,9*200mm,10*200mm(options) Package Included: 1PCS 200mm Extra Long Drill Bits TIPS ❤Please add some water during the process of drilling, in case of breaking the bits. ❤Please take protective measures during use to avoid accidents. [200MM & HIGH QUALITY MATERIAL]which are longer and drill deeper than standard ones. Made of High-speed steel, these drill bits are , and they have high abrasion resistance&long service life. [DOUBLE-GROOVE DRILL&ROUND SHANK]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 drills. [EXQUISITE CRAFT] drills are formed after quenching, and they meet the industrial tolerance standards for bore diameters. Each bit meets industrial performance and safety standards. [WIDE APPLICATION]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.Specifications:Length of each drill bit:200mmMaterial: High-speed steelDiameter of drill bits Length: 2