Suitable for all types of grinder heads to be clamped. Excellent for grinding and polishing metal components such as cylinder heads, valve ports and small industrial components. Chuck size: 6mm, 3mm, for standard 3mm and 6mm grinding bits. High clamping force, good grip stability. < p>High quality carbide material, good flexibility and wear resistance. Product Description Description: Chuck Size: 6mm , 3mm, for 3mm and 6mm. High quality carbide material, good flexibility and wear resistance. Suitable for all types of clamp grinder of grinder head. Excellent for grinding and polishing metal components such as cylinder heads, valve ports and small industrial components. High clamping force, good grip stability. Features: Material: Carbide Alloy. Color: Black. Collection Chuck: 3mm/6mm. Dimensions: approx. 27 x 10 cm. Contents: Pack of 2 3mm air grinders. Pack of 2 6mm air grinders. Note: Because measurements are taken by hand, sizes shown may vary by 1-3mm . Please only order if you accept this margin of error. The actual color of the item may vary from the color of the photos depending on your computer display settings.