New 1 piece of 100mm 4" diamond coated cutting disc. The size is 100mm outside diameter, the hole in the center is 20mm diameter (together with an adaptor for 16 mm), 1mm thickness. The size is 100mm outside diameter, the hole in the center is 20mm / 16mm diameter, 1mm thickness. RPM 12000. The disc is diamond plated on both sides. | You can use it on a disc grinder to cut & shape. Grit 80. Perfect for glass or tile. Please add water when use it. US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.