1PK 6" Tri-Dolly With Three 1-1/4" Polypropylene Swivel Casters With Steel Bearings. Platform Dimensions: 6" L x 6" W x 2" Depth. 200LB Load Capacity. Adds Mobility To Heavy, Bulky Items In the Basement, Garage Or Patio. Has Padded Bases and Center Mounting Hole.