TFL Twin stuffing tube mount for 5/16" stuffing tubes. Included an oil cup to hole your favorite oil. The gravity-fed system will help lubricate your cables while you run to reduce cable fatigue. Requires: (2) 5/16" Stuffing Tubes Includes:Black anodized mount with oil cup. (Everything in picture 1)Specs: 5" (129mm) Spacing for the popular rc gas-sized boat rail mounts. 5/16" holes for K&S Stuffing Tubes