Features:* * Made of high-quality high-speed steel, , high wear resistance and long service life * Double notched drill bit and round shank] adopt double notched chip design, these drill bits can speed up the drilling process and chip removal * Round shank is suitable for most kinds of hand drills and hammer drills * Widely used] suitable for various materials, such as mold steel, spring steel, white steel, ordinary steel, aluminum, copper, wood, stainless steel (within 1-4mm), plastic and pvc, etc. Specifications:* Material: High Speed Steel * Color: Silver (As Pictures Show)* Drill Size : (Approx.) Diameter: 2/3/4/5/6mm Length: 160mm Tips:* Please add some water during the drilling process, in case the bits break.* Please take protective measures during use to avoid accidents. Package Contents: 5*160mm Extra Long Drill BitNote: 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.