Shank: 1/4 inch Hex Shank
Size: 4-32mm:4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm
Color: Bronze
Material: high speed steel
Pay attention:
1. The drilling speed can not be too fast,rotation rate from 250 to 400 is recommended.
2. It is much necessary to add water or coolant to protect the drill.
3. If drilling diameter is greater than 14mm,we recommend to use bench drill.
Package Contents:
1 * 4-32mm Drilling Bit
