【Strut Trolley Rollers size】：Steel plate hole diameter-9/16”(14mm);thickness-0.19”(5mm). For use with 1-5/8" Wide and All 1-5/8" or Taller Strut Channel 【Unique design】：4 Wheel Trolley Assembly Rollers smoothly and fits easily in strut channel,stays centered in the slot with good side clearance so bolts don't rub or catch on the slot 【Bearing Max Load 1800 Lbs】：Strut trolley uses high-quality bearings, the body is constructed of solid steel, Each bearing connect the main steel with a fixed size spacer to make the whole roller trolley more stable 【Versatility】：You can use it to install ceiling trolley systems or electric lifts, or use it in your DIY projects, Can use upside down 【Quality Service】：If you have any issues with the strut channel trolley then just let us know and we will solve it for you within 24 hours to ensure you are completely satisfied Operate Steadily: Hoist trolley standard deep groove ball bearing installation, is very smooth no noise to it when used.Bearing welding positioning, to ensure the stability of the work. Unique Design: The bolt is in the fastening groove, trolley will not be blocked in the channel.4 Wheel heavy duty trolley assembly with silent wheel. Easy Operation: When using, just push the wheel into the pillar channel, you can use the cart upside down. Style: 4 wheel trolley assembly roller Color: Silver Material: Zinc Plated Steel Package Contents:strut trolley 2PCS