Use on tripod to facilitate quick attachment and removal of the camera. The quick coupling can be attached to a tripod with either a 3/8" or a 1/4" thread. Suitable for all H / 500 / 2000 and 200 series as: H1, H2, H3, H4D, H5D, H6D, 500C, 500C/M, 501C,501CM, 503CW, 503CX, 503CXi, 202FA, 205FCC, 203EF, 500EL, 500ELM, 500ELX, 553ELX 555ELD...etc.
eBay