The Vanguard QS-52 Quick Release Shoe is a long plate with a 1/4"" camera screw and an anti-rotation pin.
It is ideal for use with the Vanguard Alta+ 254CO, Alta+ 255CO, Alta+ 233AO, Alta+ 264AO, Alta+ 265AO Tripods and the Vanguard PH-21 and PH-31 Panheads