Stake PocketThe easiest and most secure way to add removeable sides to a trailer. Sized to receive standard 2″ x 4″ studs.Features:Bolts onto trailer 11 gauge Hot dipped galvanized3/8″ holes for bolting to frameCenter hole for an optional locking boltDimensions: 2-1/2″ x 1-1/2″ x 3-1/2″