RollerMASTER steel rollers for Adhesive-backed Membranes Use the 75# roller to pressure set the membrane adhesives to the substrate. 2 (each) 4" dia. x 10" long Steel Rollers make 20" wide path for rolling both 36" and metric products. Rollers turn independently in opposite directions for sharp turns (like tank treads on an armored tank). Make sharp turns (90 or U-turns) easier without wrinkling or tearing membranes. Independently floating Dual-rollers make rolling over irregular surface imperfections easier. Sturdy Steel Tubing Handle.