100mm concave polishing pad 1)polish convex surface 2) 50# to buff 3)For Marble,Ganite,Concrete 4)Thickness: ... as requied 100mm concave polishing pad1)polish convex surface 2) 50# to buff 3)For Marble,Ganite,Concrete 4)Thickness ... , #200, #400,#800,#1500, #3000,buff3"75mm4"100mm concave polishing pad