The Madison EDC Carabiner from The James Brand. 

Details
The Madison is the younger sibling of the Mehlville, which was our very first carabiner and continues to be a constant best-seller. Like the Mehlville, the Madison features a machined two-compartment design to keep your keys securely attached even when getting the Madison on or off a belt loop.
The Madison is machined from billet 6063- T5 aluminum, which gives it a high strength-to-weight ratio. The thinner design of the Madison means that it always hangs straight; there’s no side-to-side rocking happening here. With less bulk, the Madison is lightweight, functional and beautiful. 

MATERIAL: 6063-T5 ALUMINUM
WEIGHT: 0.5 OZ / 13.6 G
DIMENSIONS: 2.8" × 1.2" × 0.4" (7.2 CM × 3 CM × 0.9 CM)
DESIGNED IN PORTLAND, OREGON
MADE IN CHINA