Uriah Products UW562050 is a replacement set of four (4) shackle straps, each 1-1/4" wide. The 9/16" mounting holes are 3-1/8" apart at the centers. Each strap is made from cold-rolled steel in the USA and meets or exceeds all DOT standards. The trailer parts that most commonly fail are shackle bolts, straps, and U-Bolts. Check your axle hanger assemblies often and replace any worn parts before they break!