Flex cable & teflon liner for the OS Max 21-XM Marine engine. This is the assembly that connects the engine to the outboard propeller. FEATURES: Steel construction Flexible wire INCLUDES: One flex shaft One shaft tube REQUIRES: Installation onto engine. SPECS: Length of flex shaft: 130mm (5.12") Diameter of flex shaft: 4mm (0.16") Length of shaft tube: 100mm (3.94")