Designed for use on Taylor Made fenders with 3/4" I.D. tubing. Maybe used on other brands; but due to variation among brands the consumer must verify a tight enough fit between the tube and product of proper function (Center tube must be small enough to keep the product halves firmly together). Vented to prevent water accumulating in fender tube. Professional ""finished"" look. Sold three (3) per pack | Taylor Made Big B Rope Lock (3 pack) for 3/8" Diameter Rope