Vanguard Quick Shoe QS-39
The is a quick-release camera plate that attaches to your camera for quick mounting to a tripod head and easy removal. It features a standard 1/4"-20 screw whose positioning is adjustable. The QS-39 quick shoe fits many Vanguard ball heads (SBH series) and pan heads (PH series).
Fits Alta+ 234AB, Alta+ 264AB, MG-8, MG-8 OS, and Tracker models S, 1-4, B-100, and B-200 tripods
PH-35, PH-50, PH-55, SBH-30, SBH-50, SBH-100, SBH-200, and SBH-250