Loading capacity is not high, pls do not use these spring snap hooks for moutaineering or climbing Material: 304 stainless steel, not iron or aluminum or 201 stainless steel Painted with black color Total have 3 sizes for this spring snap hooks, 2", 3-1/8", 4", pls choose the correct size you need 2" spring snap hooks loading limit is 200 lbs, 3-1/8" spring snap hooks loading limit is 400 lbs 4" spring snap hooks loading limit is 650 lbs Could open and close smoothly as the spring-loaded gate makes it easy to attach important items to a pack or belt Great for backpack, key ring, chains, ropes, camping, hiking, fishing, pet, boating,indoor outdoor equipment gear, DIY accessories Great for DIY craft project, also could be used to hang LED, flowers, picture frames, tent and so on You have more choice to use at home, outdoor, in the garden We supply different 304 stainless steel products like cables, hooks, o ring, keyrings, screws, carabiner, quick links and so on.you could find from our amazon store"DGOL" LOADING LIMIT: 200 LBS (91 KG),EASY TO USE PLS DO NOT USE AS MOUNTAINEERING OR CLIMBING SAFETY CARABINER MATERIAL: MADE OF 304 STAINLESS STEEL, AND COATED WITH BLACK COLOR SIZE: OVERALL SIZE IS 2" * 1" (50.5 MM * 25.4 MM),CABLE DIAMETER IS 0.18"(4.7 MM). WE ALSO HAVE 3-1/8", 4" SPRING SNAP HOOK WITH SAME DESIGN AND QUALITY, YOU COULD FIND IN OUR AMAZON STORE"DGOL" COULD BE USED FOR BOATING, SAILING, CAMPING, FISHING, HIKING, TRAVELLING, AND SO ON. ALSO COULD BE USED FOR HANGING PLANT, TENT, FLOWERS, LED LAMPS. YOU WILL HAVE MORE CHOICE TO USE OUTDOOR, AT HOME,IN THE GARDEN PACKAGE INCLUDE 10 PCS 2" LONG 304 STAINLESS STEEL BLACK SPRING SNAP HOOKS