These Rubber Tie Downs are designed for use with Drainage Tarps roof leak diverters, and come in sizes of 10", 21", or 31". The rubber tie downs can be easily to the ceiling leak diverters— simply attach one "S" hook of the Rubber Tie Downs to D-Rings of Drainage Tarps and the other "S" hook to a structural part of the ceiling or roof decking. SPECIFICATIONS FOR "S" HOOKS 0.172 diameter, C-1019 silicone kilned hard temper galvanized wire, dry wax coated to protect from rust.