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Material of Construction: Steel.Made in China.Powered/Manual: Manual.Agency App/Cert: None.Cubic Ft: 0.36.Heavy duty trolleys designed for flexibility of installation.Usable on straight or curved track.Adjusts for wide variety of beam widths; simply remove end nut and adjust spacers.Can be instalLed or removed from any point in the track.Fits I-beam flange width 4.125" to 7".Handle Type: None.Floor lock: None.Capacity: 4000 Lb.Dimensions: 13.25" W x 12.64" H x 11.375" D.Warranty: 90 Days.