1. Complete specifications, easy to use, wide applicability 2. Carbon steel material, sturdy and durable, not easy to rust, wear-resistant and anti-corrosion 3. Purpose: used for engraving machine, trimming machine to transform handle, big to small 4. Material: carbon steel 5. Specification: 10-8/10-6/12-8/12.7-10/12.7-8/12.7-6.35/12-6/12.7/6/12-10/8-6.35/8-6/9.5- 6.35/10-7 6. Size: length is about 2.8 cm/piece 7. Weight: about 150g/set (13 pieces/set)
