characteristic There are 6pc different drill bits, including 6mm, 8mm, 10mm, 12mm, 14mm,16mm. overall length: 230mm. You can choose the most suitable wood snake drill for the woodworking. These drill bits is made of high-carbon steel(45# ), which is solid and durable. And there is no needs to worry that these drill bits will snap or go blunt when you using them. The central solid design makes the drill bit stable and strong during the drilling, and the wide blade slot can provide faster drilling, easier chip removal and smoother hole walls. these bits are perfect for most drilling jobs and materials such as aluminum, wood, plastics pvc and other different materials or your daily drill use. describe Name: woodworking hole opener set Material: steel Quantity: 6pcs/set color: Silver Package Contents: 1 x Woodworking hole opener set Only the above package content, other products are not included. Note: Light reflection 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.