Greenlee 353-900RG Specialty Recip Blades, 9 X .75 X .039, Carbide Grit, 1-Pack For cast iron pipe, block and brick, abrasives, stainless steel, cement board, fiber board and plaster Designed to cut through tough construction materials such as cast iron pipe, masonry block, cement board and stainless steel Depending on material, specialty blades have carbide-tipped or full carbide teeth, carbide grit or diamond grit for demanding construction materials