ATLAS LEFT MANUAL SWITCH MACHINE HO GAUGE This Left Hand Manual Switch Machine is Designed for Your HO Scale Track Layout by Atlas Model Railroad. FEATURES Screw-on manual switch. With a manual control switch, you can change the direction of the rails at the switch itself. Black plastic construction. Metal machined screws and hex nuts are provided. Detailed illustrated instructions provided on package. INCLUDES One Manual Switch Machine (Left) REQUIREMENTS Flathead Screwdriver SPECIFICATIONS Scale: HO 1:87 Length: 3-7/8" (98mm)