Features: brand new and high quality High Quality Material: Made of high quality carbon steel, stable, firm and durable. Specifications: 6 to 6mm, 6.35 to 6.35mm, 6.35 to 8mm, 8 to 12mm, 8 to 12.7mm, 8 to 8mm, 12 to 12mm, 12.7 to 12.7mm. Application: Good performance, convenient and practical, suitable for home and professional use. Package Includes: 1x drill bit set wood milling cutter. Wide Compatibility: Works with PCB, SMT, CNC, Mold, plastic fiber, carbon fiber, hard wood, printed circuit board, and other precision parts processing. Specifications: Material: Carbon Steel Color: As the Picture Shows Specifications: 6 to 6mm, 6.35 to 6.35mm, 6.35 to 8mm, 8 to 12mm, 8 to 12.7mm, 8 to 8mm, 12 to 12mm, 12.7 to 12.7mm Net Weight: 100g/0.22lbs 100g/0.22lbs 100g/0.22lbs 130g/0.29lbs 130g/0.29lbs 130g/0.29lbs 140g/0.31lbs 140g/0.31lbs Package Includes: 1x Router Bit Extension Rod note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Note: When using, the speed should be slow at the beginning. When the rotation is stable, it will speed up slowly. If used too fast according to the inertia, it will cause the machine to shake.