"Rugged steel frame hoist is easy to handle. 1/4 inch load chain is hardened for strength and durability. Housing is enclosed so you can use this hoist outdoors. 5 5/8 inch diameter wheelcover is 4 3/4 inch wide, has guide slots to guard against jamming and slipping. Roller and ball bearings reduce friction. Two ton capacity15 inch head room required" Material Handling