Sled dolly used in combination with other dollies. By placing a Fisher, Panther, Chapman, or Matthew’s doorway dolly into the 32 Wheel Channel, the weight is evenly distributed over 32 wheels, eliminating the jiggle of bumps and gaps in the track. It allows dollies to be run on straight or curved track (10ft or larger radius) (standard track 24.5″ (60.025cm) Shipped completely assembled. (ALSO AVAILABLE FOR WIDE 32″ (78.4cm) track at additional cost.)