The CMI Velocity Micro Trolley is a smaller version of the Heavy Duty Trolleys that CMI Makes. This trolley will work on up to 1/2" rope and cable. It features 1.5" Stainless Steel Sheaves that are on ball bearing and a Stainless Steel axle. Made in the USA. The trolley is easily removed from the rope or cable by unclipping the attachment carabiner and sliding upward and off.