Extended-Stem Threaded Stem Caster for Ladders Swivel Caster 75 lb Load Rating 0 to 299 lb 2 in Wheel Dia 7/8 in Wheel Width Rubber Wheel/Tread Material 2 1/2 in Mounting Height Plain 5/16 In.-18 x 4-15/16 in Caster Stem Size Threaded Steel Caster Frame Material Zinc Plated Frame Finish No Non-Marking 1 Number of Wheels