... nickel or titanium are available Electroplated Diamond Cutting Blade Features: 1.Diameter:4"-7" available 2.Diamond Grit:40-80# available 3 ... lifetime.7.Usage: Suitable for cutting and grinding various hard materials, such as marble, concrete,brick, granite, glass, fibre glass, ... and high quality diamond wheels and tools,since we are professional experienced manufacture in this field for over 10 years ...