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Square Concave Grating class C 250

Square Concave  Grating  class C 250     , sizes from: cm 30x cm 30 ; cm 40 x cm 40 ; cm 50 x cm 50 ; cm 60 x cm 60 ; cm 70 x cm 70 ; cm 80 x cm 80 ; cm 90 x cm 90 ; cm 100 x cm 100 ,CM 1200 X CM 1200 ,  with En certificate  ICMQ  Milan Italy