RIGID, V-GROOVE TRACK-WHEEL PLATE CASTER, LOAD RATING 800 LB, SWIVEL LOCK TYPE NO LOCK INCLUDED, WHEEL DIA. 4 IN, WHEEL WIDTH 2 IN, WHEEL/TREAD MATERIAL IRON, WHEEL CORE MATERIAL CAST IRON, NON-MARKING YES, NUMBER OF WHEELS 1, CASTER BRAKE TYPE NO BRAKE INCLUDED, TREAD SHAPE V-GROOVE