100 Steel Spring Snap Quick Link Carabiner Hook Clips 4" total length; 3/8" thick; 5/8� ID of Small End; Heavy Duty: Rated at 320 lbs. This premium quality, heavy duty Spring Clip has been designed tough and made from the highest quality materials. Product is backed by a no-hassle One Year Guarantee against defects. Material: Zinc - Plated. Made durable and ready to handle tough environments. One Year Guarantee against workmanship and defects.