Stake Pocket. The 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 galvanized. 3/8" holes for bolting to frame. Center hole for an optional locking bolt. Dimensions: 2-1/2" x 1-1/2" x 3-1/2"