Diamond Grinding Block,Diamond Block,Grinding tool Specification: Length 140mm,170mm USED FOR ROUGH AND FINE GRINDING OF STONE SLABS AND PORCELAIN ... masonry, brick, block and natural stones.Features:1) Used for grinding and polishing stones2) Grit: #30 - 2203) Specifications: 170mm ... /6017000m470/8022000m580/10029000m6100/12037000m7140/20040000 Diamond Grinding Block,Diamond Block,Grinding tool