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 Toggle cars let you fasten mainsheet and control blocks directly to the toggle without extra shackles on the blocks Cars with pivoting attachments can handles loads as much as 40 from vertical and still run smoothly Torlon bearings HAR #2748 large toggle accepts 57 mm double and triple Carbo AirBlocks Please call us if you have questions regarding gear selection for your boat