[High-quality material] The use of high-quality Aluminum alloy, with high hardness, can easily cope with the needs of multi-directional drilling.[6 size drilling bit] M14 sleeve, 20mm, 35mm, 40mm, 45mm,50mm and 68mm.[Strong versatility] Suitable for all angle grinders with M14 sleeves[Punching range]: This set of drilling bits can meet the drilling needs of most people, and can be used on a variety of materials, such as ceramics, porcelain, granite, marble, plastic, glass fiber, pebbles, etc. It is commonly used in building materials and stone. Casting, composite materials and other industries.[Precautions] Please use cold water for cooling after using the drilling bit, which can better improve the service life of the bit.Material:Aluminum alloycolour:blackPackage Contents:1 * Diamond Core Bits SetOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.