OSE CNC Rail Motor Mount.Designed to fit outriggers with a width of 3" or a rail-type system that already has the rails installed. See picture 4.Fits 36 and 40mm diameter motors. Required M4 mounting screws to mount to your rail systems.Specs:Length: 61mm (2.40")Width: 75mm (3")Height: 38mm (1.50")Weight: 51 g (1.8Oz)Motor Screw Spacing: Approximately 25mm (1")Front plate screws: Includes M3 screws to assemble the parts.Mounting screws required: M4, in a length that goes through the rails. Typically 12- 20mm long.