The special design of the brad point penetrates surfaces quickly. Commonly used to drill holes when installing hubs, mail boxes and electrical operation. The innovative design of the flute removes the material more quickly for easier drilling. Perfect for all woodworking. Material: Carbon steel Color: black Silver Size: 4mm, 5mm, 6mm, 8mm, 10mm Quick-change quick neck Brad point top Package includes: 1x 4mm Brad Point Twist Drill Bit 1x 5mm Brad Point Twist Drill Bit 1x 6mm Brad Point Twist Drill Bit 1x 8mm Brad Point Twist Drill Bit 1x 10mm Brad Point Twist Drill Bit Only the above package content, other products are not included. Note: Light shooting 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.