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stone cutting disc Features: 1) We can supply grinding wheels and cutting wheels for steel or stone 2) Size: 4", 4-1/2", 5", 7", 9", 12", 14" and 16" Material (the reinforced cutting and grinding discs are made of these materials): 1) Aluminium oxide: A 2) White aluminium oxide: WA 3) Single crystal aluminium: SA 4) Zirconia aluminium: ZA 5) Black silicon carbide: C 6) Green silicon carbide: GC Total types of products (3 types of cutting and grinding discs in the structure): 1) T41 flat cut off discs 2) T42 depressed center cut off discs 3) T27 depressed center grinding discs 4) T 6 Cup wheels = grinding stone The meaning of "T41 A30 R5BF 80m/s": 1) T41: T41 flat cut off disc 2) A30: aluminium oxide material grit 30 3) R: hardness grade 4) 5: structure number 5) B: combined material "resin" 6) F: fiber glass reinforced 7) 80m/s: r.p.m, means meter per second, rotary speed