Heavy Duty 1/4" 8mm 12mm 1/2" Shank Milling Cutters 8mm Wooden Shank CNC Bit Shank End Mill Engraving Wood Carbide 40JEchs: & Material: Carbon Steel, Stable, Strong and . 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 Included: 1x Wood Cutter Drill Bit Set. Wide compatibility: works with PCB, SMT, CNC, mold, plastic fiber, carbon fiber, hardwood, printed circuit board and other parts precision processing. Specification: Material: Carbon SteelColor: As the picture showsSpecifications: 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 12.7mmNet Weight: 100g/0.22lbs100g/0.22lbs100g/0.22lbs130g/0.29lbs130g/0.29lbs130g/0.29lbs130g/0.29lbs140g/0.31lbsPackage Included: 1x Extension CutterNote: 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 first. When the rotation is stable, it will accelerate slowly. If used too quickly depending on the inertia, it will cause the machine to shake.