These Nite Ize Black Stainless Steel S-Biner are made of high-quality, weather resistant stainless steel. 
 
This ultra-handy accessory, with its dual spring gates, will hold, secure and connect everything from house keys to technical camping gear. 
 
Backpacker Magazine said it best when they wrote "Don't ask yourself if you need this useful little widget. The question is: how many?"
 
Available in three sizes to suit a wide range of applications:
 
Sizes
#2 - 49.75mm x 21.71mm (weight rating: 10lb / 4.5kg)
#3 - 67.97mm x 30.09mm (weight rating: 25lb / 11kg)
#4 - 89.41mm x 39.92mm (weight rating: 75lb / 34kg)
 
IMPORTANT!!! - These carabiners are NOT suitable for climbing or supporting your body weight in any way and the load MUST NOT exceed that stated.