Depressed centre discs Depressed center metal grinding disc in 4inch diameter for agressive grinding action and smooth running wheels. The amount of removed metal is reduced, increasing cutting speed and reducing the heat generated. Ideal for professional use 4 inch grinding wheel Depressed centre discs Depressed center metal grinding disc in 4inch diameter for agressive grinding action and smooth running wheels. The amount of removed metal is reduced, increasing cutting speed and reducing the heat generated. Ideal for professional use Features 1) High-quality white aluminum grains 2) Excellent durability and sharpness with less down time 3) For all types of metal material cutting 4) High security Assured with MPA, EN12413 and OSA standard 5) Reinforced double Fiberglass mesh, front and back Key Specifications: Sintered mesh filter discs is made of SS multi-layer sintered wire mesh through laser-cutting Mainly used in explosion-proof components, noise components, pressure, and flow meter and other precision instrument components Materials: SS304, SS316, SS316L Note: can be made according to customer requirements for edging, adding outer rings. It can be processed into circular, fan-shaped, square, and other special shapes according to customer's requirements We're established in2018yr, Yongkang Nova Hardware Co., Ltd. is a manufacturer trader specialized in the research,development and production Cutting Wheel.We are located in Yongkang City ,Zhejiang Province,with convenient transportation access. All of our products comply with international quality standards and are greatly appreciated in a variety of different markets throughout the world. If you are interested in any of our products or would like to discuss a custom order for wholesaler or retailer. please feel free to contact us. We are looking forward to forming successful business relationships with new clients around the world in the near future. our products including: cutting disc,cutting wheel,grinding wheel,flap wheel,abrasive wheel,etc. Abrasive Type A- Aluminum oxide ZA-Zirconium aluminum grain/ Aluminum oxide C-Silicon Carbide AC-Aluminum oxide/Silicon Carbide Z-Zirconium aluminum grain WA-White aluminum oxide Grit Size 16-24 coarse Structure 0-3 tight 30-60 medium 4-7 medium 70-220 fine 8-14 open Bond BF-Phenolic resin Hardness D-L soft M-N medium P-S hard T-Y very hard