Features It has 100mm outer diameter and 22.23mm inner diameter which will fit for many grinders. With air holes designed to aid in and maintain a cool stable cutting pattern and reduced wear. The thickness is 4.5mm that ensures its durability and long service life. This segment grinding wheel uses diamond as abrasive for good grinding effect. Widely used for grinding concrete, marble and many other stone materials. Features:This segment grinding wheel uses diamond as abrasive for good grinding effect.It has 100mm outer diameter and 22.23mm inner diameter which will fit for many grinders.The thickness is 4.5mm that ensures its durability and long service life.With air holes designed to aid in and maintain a cool stable cutting pattern and reduced wear. Widely used for grinding concrete, marble and many other stone materials. Specification:Abrasive Material: DiamondGrit Size: #100 Outer Diameter: 100mm/3.9in Inner Diameter: 22.23mm/0.9in Thickness: 4.5mm/0.2inMaximum Linear Speed: 40rpmQuantity: 1 Weight: Approx.199g/7oz Package List:1 x Grinding Wheel1 x Gasket Package List