Boom bridle, sliding in the lower rail, for attaching pulleys, vang, etc. ... . - - Boom pendant, sliding in the lower rail, for attaching pulley, vang, ... Made of 316 stainless steel, supplied with fixing screws.64 x 16mmdiam. inside 15mm, outside 25mmWeight 61gr ADJUSTABLE STAINLESS STEEL BOOM SLIDE A4258 Technical documents can be downloaded here