Diamond Grinding Blocks: 1.Metal Block:30#,40#,50#,60#,80#,100#,120#, ... # 2.Resin Block:400#,600#,800#,1500#,3000# Diamond Grinding Blocks: Be used for automatic continuous polishing machine or single head ... is very important for shipping.3.All payments must come from a confirmed address and we will only ship to confirmed ... ,buyer pays all shipping charges; no refunds for shipping returned from buyer.