Premium Quality HD Plastic Adjustable Hooks. Works with 1/4", 5/16", and 3/8" Shock Cord. Also fits 3/8" Rubber Rope (Will not fit 7/16"). Made in the United States of America. Patented Non-Slip Design Allows hooks to be used on ends or in the middle to make your own custom straps. Hook opening is 3/4" wide. Each hook measures 2 1/2" long x 1 3/4" wide. Great for truck tarps, boat covers, farms, tire chains and any other general application where you need premium hooks.