This National Hardware eye/eye turnbuckle tightens and draws together lines and cables in various applications. The lightweight extruded aluminum body has a steel wire eye on both ends, and the hex design allows for easy adjustment by hand or with a wrench. Turnbuckle size = Safe Working Load (SWL)3/16" = 45 lb SWL7/32" = 55 lb SWL1/4" = 90 lb SWL5/16" = 130 lb SWL3/8" = 215 lb SWL1/2" = 320 lb SWL | HILLMAN 2170BC Eye/Eye Turnbuckle | Size 5/16" x 9"