MetalTech Galvanized Pig Tail Lock M-MLG Pack of 25 MetalTech M-MLG Metal Tech pig tail lock used for stacking both mason and arch scaffolding frames. No tools are necessary. Simply slide into the lower end of the scaffold frame and coupling pin to lock securely into place. High strength steel with a curved design to fit most standard tube sizes. You will get an automatic feedback as soon as you leave a positive feedback to us. The system will send you a feedback in a second after you send a feedback to us. We do our best to get our customers satisfaction. IF YOU HAVE ANY PROBLEM WITH THIS ITEM IMMEDIATELY CONTACT US. WE WILL BE HAPPY TO SOLVE THIS PROBLEM.