Mega-Coupler Black Finish Stainless Steel has solid nut tabs that won’t break off. The Mega-Coupler uses standard half inch by 1-1/4 inch long hex head grade 8 bolts to secure your load. The bolt head locks into a hex milled pocket so that you can tighten the nyloc nut while the clamp is installed. It has an industry compatible 14 mm thick base. The Mega-Coupler fastens from (1-1/4" Pipe) 1.66" OD to 2" OD truss tubes.