Use for supporting sagging floors, weak beams and warping stairways. 2-1/4" x 15 gauge prime steel inner tubing. 2-1/2" x 15 gauge prime steel outer tubing. 2-1/4" steel collar. 1" x 6" steel screw. Two 4" x 4" x 10 gauge steel plates. 7" turning handle. Grooved pin and plain pin. Flow coated with red corrosion-resistant paint. Packed with instructions. UPC symbol on carton. Maximum load capacity obtained at lowest extension.