Small Size 3 in 1 Mini Compass + Thermometer + Snap Hook Multifunctional Hiking Metal Carabiner Compass. Carabiner hooks are designed to be extremely durable, weather resistant and rust-free, no sharp edges, safe for both indoor and outdoor using, Perfect for climbing, camping, walking, traveling, hanging tent, hanging kettle, hanging towel, hanging backpack, hanging key ring, etc. 2 5/8" L x 1 3/16" W x 3/8" H