Heavy duty spring hanger for 1-3/4" wide springs. Accepts 1/2" bolts for mounting and spring. Bolt spacing measurement is 1-3/4" on center, OAW is 2-1/8", OAL is 4-1/2". Hole is 2.25" from top plate to center hole. Designed to be through-bolted to trailer frame (not wide enough to u-bolt to frame)