This is a 3″ left hand Outer Cross Tube from Miller Industries. It features a cam lock to hold the wheel grid onto the crossbar, a cam lock to hold the L-Arm in, and 2 hooks for a ratch & strap style hold-down. This cross tube fits 3″ x 3″ square crossbars. This cross tube receiver fits Century and Champion 10 Series Car Carriers. Uses Cam Lock to Hold Wheel Grid OnUses Cam Lock to Hold L-Arm In2 Hooks for Ratchet & Strap Style Hold-Down (for Safety Chains) Fits:Century 10 Series CarriersChampion 10 Series Carriers