Description: These grinding discs uses diamond as abrasion and combined with composite material. There is sticky cloth on the back which can stick on milling machine. They are mainly used for process, repair and renovation on stones, glasses, floor tile, marble, concrete, cement, etc. With strong grinding force, good flexibility, durability, they are ideal stone grinding tools and stones will have a good glossiness and smoothness after polishing. Features: 100% brand new and high quality. Use diamond as abrasion and combined with composite materials. Sharp, wear-resistant and high efficiency, strong grinding force. Polish quickly, durable and long service life. No color will left on the surface after polishing, good smoothness. Mainly used for stone, glass, ceramics, crystal, ceramic stone, concrete, etc. Specifications: Product: Grinding Discs. Material: Diamond, resin. Color: As the picture shown. Dia: approx 100mm/3.94. Grit:50 +100 +300 +500 +800 +1500 +3000 . Quantity: 7 pcs/lot. Note: Transition: 1cm=10mm=0.39inch. Please add water when you operate. Please allow 0-5mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 7 x Diamond Grinding Discs. No retail package