OTC 1904 6-pt. Locknut Socket (2-9/16”) - This high-grade truck wheel bearing locknut socket is made of high-strength steel with a 6 point opening 2-9/16". Similar to Ford No. 205-040 (T70T-4252-D). Measure from flat to flat to determine size of locknut, then consult chart below to find the correct socket. NOTE: Sockets are designed for use with 3/4" square-drive manual tools only. Impact tool use VOIDS sockets' warranty.