Here's an  all brass Harbinger Carabiner which can be used to carry keys or other gear you like having at the ready.  Dimensions with the swivel and keyring are 4 inches for the height and its two inches wide at its widest point.  Except for the spring (stainless) the construction is 100% brass.  Weight on this piece is 85 grams, or about 3 oz.  Only 9 of these pieces have ever been made and of those only two come with the spirit level in the spine.  If you've been wanting any of my work for your collection, this is your chance to own a premium example.  Note:  This one also comes with a thumb stud for assisted opening, I can swap this out with a standard button head screw if you prefer the slimmer profile, but you have to let me know when you submit your order.