3/4" x 150' Black 3M SJ3540 Dual Lock Fasteners $657.13 3/4" x 150' Black 3M SJ3540 Dual Lock FastenersFastens heavy items creating a more permanent bond.Rigid plastic stems interlock for hundreds of closures. Rubber based adhesive on back of a polypropylene, reclosable fastener. 75 feet of usable product... Add to Cart