"The JET 1/2-Ton, 115/230V Electric Trolley can lift up to a 1000-lb. load. Mounts to 3in. to 5in. I-beams and wide flange beams. Includes Solenoid operated traveling brake, Power Source 115/230v, Product Type Trolley, OSHA Approved Yes, Flange Width in. 3-5, Adjustable Yes, Phase Single phase, Capacity lbs. 1,000, Finish Type Powder-coat, Travel Speed ft. per min. 39 1/3. Designed to give single control convenience Features 115/230V, 1 phase wiring specify voltage when ordering Solenoid operated traveling brake Adjustable to fit 5in. min. to 7in. 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 1/2in.L x 14 1/8in.W x 12 7/8in.H"