The vanguard qs 39 quick release shoe has a 14 camera screw it measures 51x42mm and is ideal for use with the vanguard ph 35 ph 50 ph 55 sbh 30 sbh 50 sbh 100 sbh 200 and sbh 250 heads as well as alta 234ab alta 264ab mg 8 mg 8 os and tracker models s 1 4 b 100 and b 200 tripods