This product is intended strictly for use in professional and industrial environments. Customer must determine whether this product complies with requirements applied where the product will be used * 4" to 11-3/4" fits beam flange width * 13.875" Headroom * Steel construction and painted finish * Each trolley includes four rollers with sealed bearings for long life * A lifting eye is located at the bottom of the trolley for attaching a hoist (not included)