The SRS family of arca rails are the lightest arca rails on the market. Made from 7075 aluminum, we were able to design an incredibly light, but tough rail at only .55 oz. These work in Arca Swiss style tripod heads. They are 1.7” OAL, and has a slot for bolt spacing up to 1.2″. Rail comes with both 10-32 and M-Lok hardware for easy installation.