s-31 tread and riser 3 line abrasive inserts rebar 1/8 caulk joint treads offer several design options and cost savings n steel pan or concrete mortar setting bed ew sleek rebar s-30 flat tread 1/8 caulk joint 3 line abrasive inserts mortar setting bed steel pan modified s-50 self-supporting tread elf supporting thin epoxy tread now available in · four-foot long tread at 1-1/2 inches thick · six-foot long tread at 1-3/4 inches thick · eight-foot long tread at 2 inches thick · labor savings are significant as most contractors or installers can set the treads · you ll save money with the elimination ...