Specifications: Made from high quality HSS steel, with the titanium coated to reduce friction and heat. The ladder of its unique structure, a bit can open a variety of specifications of aperture. Do not need to use the center punch, compared with ordinary twist drill, more durable. Deburring, chamfering, elliptic hole enlargement, twist drill, drill, bench drill. Type: Steel Drill Bit Material: High Speed Steel Style: 1/4-1-3/8, 3/16-7/8, 1/4-3/4, 1/8-1/2, 3/16-1/2 Features: Durable, Multifunctional, Hole Cutting Length: 8cm/3.15" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes:(Others Not Included) 5 x Steel Drill Bit