Hotforge Screwgate Carabiner. Black Diamond HOT FORGE SCREW GATE CARABINER is a multi-functional, lightweight a,nd compact keylock locker.. It features a hot-forge construction—allowing them to remove weight where it’s not needed and add material where durability is key—and a low-profile, non-snagging nose that’s easy to clip and clean. Ideal for use at belays, top roping, or whenever you find yourself in need of a trusty locker, the HOTFORGE accommodates a clove hitch and is built for everyday climbing missions that demand reliability and durability.