Made of strong hard tungsten steel and not easy to bend and break
Diameter 3mm, Length 45mm, Shape: 30º/45º/60º/75º/90º/105º/120º, square and rectangle
Professional for jewelry makerl, used with pneumatic impact engraving machine, air hand graver
High concentricty and high speed, the bit can cut clean without any ragged edges, High precision and convenient to use, practical accessory for jewelry processing