22 mm Small Boat Captive Bearing Traveler Cars are machined from solid aluminum, and are lightweight and strong. Their captive ball bearings run smoothly - even under load. Cars with pivoting shackles, toggles, or pivoting sheaves feature low attachment points, allowing them to better handle non-vertical loads. Cars with built in sheaves can be used with 1:1 or 2:1 purchase systems. Cars with toggles or tangs can be fitted with double blocks for purchase systems as high as 4:1. Cars roll on/roll off track - no spilled bearings Open top return race reduces weight and exposes balls for rinsing Cars with pivoting attachments can handles loads as much as 40 from vertical and still run smoothly Cars up to 500 lb (227 kg) SWL have Delrin bearings; higher working load cars feature Torlon bearings Please call us if you have questions regarding gear selection for your boat