Features:* .* The drill bits in the package are 200mm, which is longer and drills deeper than the standard ones. Made of high-speed steel, these drill bits are , and have high wear-resistant and long service life.* With a double-flute chip removal design, these drill bits can speed up the drilling and chip removal process. The round shank is suitable for most types of hand drills and hammer drills.* The drills are made after hardening and meet the industry tolerance standards for hole diameters. Each bit meets industrial performance and safety standards.* Suitable for a variety of materials, such as die steel, spring steel, white steel, plain steel, aluminum, copper, wood, stainless steel (within 1-4mm), plastic and pvc, etc. Specifications:* Length of each drill bit: 200mm * Material: High speed steel * Drill bit diameter: 2/3/4/5/6mm Package Contents:5pcs extra long drill bits Note:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.