Multiple Line Mule Sheaves. These pulleys are used to mule operating lines around pillars, framing and other objects. The pulleys are designed to be directly mounted to a ceiling or wall structure via the four (4) 5/16" mounting holes provided in the base. The pulleys can handle up to 1/2" diameter O.D. cord or cable. These pulleys are rated for a 75-pound load provided all mounting points are used and proper mounting hardware is used.