1. Material: carbon steel 2. Purpose: used for lengthening the shank of milling cutters, engraving machine trimming machine accessories 3. Shank form: round 4 Strong and durable, not easy to deform 5. Small and convenient, easy to carry 6. Size: 1/4mm to 1/4mm=6.35x22x81mm; 1/2mm to 1/2mm=12.7x26.8x81.7mm; 8mm to 1/2mm=8x26.5x83.5mm; 1/4mm to 8mm=6.35x22x81mm; 12mm to 12mm=12x26.8x81.7mm; 8mm to 12mm=8x26.5x83.1mm; 8mm to 8mm=8x22x81mm; 6mm to 6mm=6x22x81mm 7. Weight: 6mm to 6mm=100g; 1/4mm to 1/4mm=100g; 1/4mm to 8mm=110g; 8mm to 12mm=110g; 8mm to 1/2mm=130g; 8mm to 8mm =130g; 12mm to 12mm=140g; 1/2mm to 1/2mm=140g 8. Note: When using, the speed should be slow at the beginning. When the rotation is stable and speed up slowly, using too fast according to inertia will cause the machine to shake
