"The JET 2-Ton, 115/230V Electric Trolley can lift up to a 4000-lb. load. Mounts to fit 4in. to 6in. I-beams and wide flange beams. Adjustable Yes, Power Source 115/230v, Includes Solenoid operated traveling brake, OSHA Approved Yes, Phase Single phase, Material Type Steel, Capacity lbs. 4,000, Flange Width in. 4-6, Product Type Trolley, Travel Speed ft. per min. 39 1/3, Finish Type Powder-coat. Designed to give single control convenience Features 115/230V, 1 phase wiring specify voltage when ordering Solenoid operated traveling brake Adjustable to fit 4in. min. to 6in. max. I-beam and beam flange widths Must be fitted with a JET 4 station 24V push-button control sold separately Durable powder-coat finish Lug mount or hook pin Electronic trolley not supplied with a 4-button controller 21 7/32in.L x 13 5/8in.W x 12 3/4in.H"