Red Hound Auto 5/16 Inch 7.9mm Steel Spring Snap Quick Link Carabiner Hook Clip - Lot of 100 100 Spring Snap Links (Carabiner Hook) Medium Capacity (130 lbs) Size: about 7/32" thick by 2-3/8" long, ID of small end is 5/16" Zinc - Plated Durable, ready to handle tough environments