Lock Shear Bolt couplers allow for easy and simple field installation since no bar-end preparation, sawing or swaging is necessary. The couplers can be installed with just a standard wrench, nut runner or an impact wrench depending on coupler size. Suitable for new construction, repair, bent bar or retrofit precast applications. Lock Shear Bolt couplers allow for easy and simple field installation since no bar-end preparation, sawing or swaging is necessary. The couplers can be installed with just a standard wrench, nut runner or an impact wrench depending on coupler size. The bolt heads will shear off when proper installation tightness has been reached, which allows for complete visual inspection. Suitable for new construction, repair, bent bar or retrofit precast applications.