Fractional fasteners enable you to affix TSLOTS metal extrusions together. Just insert a T-Nut and fastener into a T-Slot, and tighten. No welding or grinding is necessary. And tightening can be performed with simple hand tools. All TSLOTS extrusions have a 2-degree taper that spring-locks fasteners as you tighten them. They will not loosen even when subjected to extreme vibration.