Trinagle Or Square Tripod Crank Stand Truss Bar Top Connecting Bracket New Square or triangle truss lighting stand adapter. 40mm. support bar/truss Works with any crank or fixed tripod stand with 35mm-40mm pole. Overall length: 17" Latches slide from 4.5"-15" (on latch center) and lock into place. Safety cotter pin ensures the bolt will not slide out.