This trolley is designed to easily maneuver a large stone slab or a glass sheet up to 1760 lbs (800kg) with 2 3/8 inches (60mm) thickness. Length is extendible to accommodate different sizes 59 – 118 1/8 inches (1500mm-3000mmm). Safe and efficient for person job, yet sturdy, durable and easy for storage. 2 rigid casters and 2 swivel casters with brakes. Contact: Email: abacosales1@abacomachines.com Skype: nomad_091090