Amazon.com: YATOINTO 0.5T/1100LBS Dual Wheels Beam Trolley, 3"-5" Adjustable I Beam Trolley, Push Manually Trolley Hoist with Dual Track Rollers, Push Track Roller Trolley for Lifting : Industrial & Scientific
Hoist Trolley - 1 Ton Capacity H-9943 - Uline
Amazon.com: Ultimation Heavy Duty 1,000 Pound Capacity I-Beam Trolley with Side Guide Rollers - Ideal for Automotive Assembly Plants - Industrial Grade, High Load-Bearing Fits 3", 4", and 6" Tall Trolley Systems :
3 Ton AMH Geared Trolley 4.02" to 8.66" Beam Flange Width 20' Drop | Crane Depot