Series 86 block and tackle is built for sideload sash applications in both residential and commercial windows and is rated class 2 on the aama verified components list, the north american fenestration standard (nafs). Series 86 is designed to allow for quick and easy installation or removal of the sash. Part# 17b12-10, 13"channel length, id stamps 12-10, 12-1, 12-a
Number. 50412787