3-Piece Level Set - Trailer & RV 3-piece vial level set for quick leveling 1-3/4" round surface level plus two 1" x 2" for side-to-side, front-to-back positioning Polycarbonate vials filled with non-freezing liquid, ABS body Can be permanently attached with glue or small screws (not included) Great for trailers, RVs, campers or other applications where levelness is critical