"A steel connecting kit for connecting EZ Rail Guide Systems together. Connects any combination of Item# 11881, 9ft. or Item# 11880 5ft. EZ Rail Mill Guide Systems sold separately. Application Mill guide connector, Dimensions L x W x H in. 8 x 5 x 1, Works With EZ Rail mill guide systems, Item#s 11880 and 11881, sold separately. Shipped only to lower 48 states."