The cutting point begins to drill in the center, eliminates the need for a central punch. 230mm long, perfect for thick pieces of wood. Made of high carbon steel with heat treatment, HRC48 - 50. Length: approximately 230mm Material:metal colour:Silver Package Contents: 5 * Twist Drill Bit(6mm, 8mm, 10mm, 12mm, 14mm) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.