advantage:
1.rough,fine and finish grinding stone surface
2.for machine: manual,multi-heads,automatic machine
3.strong grinding ability,low cost and high efficiency.

Grits: 50#, 200#, 400#  with metallic bonded for rough grinding

whereas the grits of 500#, 1500#, 3000# are resin bonded for fine and finish grinding.

manual machine

automatic mahcine

multi-head machine