The Horse C1 OHS-2320 is a purpose-built marine fire door lock, made from AISI 304 stainless steel so it can handle the constant moisture, salt air, and vibration that would affect ordinary mild steel hardware at sea. Horse (Hujiang) designed the C1 series specifically for doors on ships and offshore vessels, and this particular lock is suitable for cabin doors as well as fireproof doors of different classification grades, making it suitable for new-build vessels and refit projects.

It comes as a 190mm case in RHO (right-hand opening) configuration, making it suitable for doors already set up in this configuration. The backset generally runs around 55–60mm with a 65mm cylinder length, in line with the OHS series, and it uses a double locking tongue for added security on doors that need to remain securely locked at sea.

Because it's fire-rated, it's designed to continue functioning when exposed to elevated temperatures. For vessel-specific orders, it's important to confirm the required door thickness and handing, as Horse locks in this range are also available in LHO, LHRO, and RHRO configurations.