The ZIPBOLT™ UT Rail bolt (13.600) is part of a program of fasteners and connectors ideally suited for the stair industry. Instead of fumbling with a nut, washer, and special wrench, the ZIPBOLT™ uses a standard hex style driver to fasten rail parts securely together. Easier, faster, and stronger, the ZIPBOLT™ UT Rail bolt is fast becoming the preferred choice of professionals.