RIGID, STANDARD PLATE CASTER, LOAD RATING 450 LB, SWIVEL LOCK TYPE NO LOCK INCLUDED, WHEEL DIA. 4 IN, WHEEL WIDTH 1 1/2 IN, WHEEL/TREAD MATERIAL PHENOLIC, WHEEL CORE MATERIAL PHENOLIC, NON-MARKING YES, NUMBER OF WHEELS 1, CASTER BRAKE TYPE NO BRAKE INCLUDED, TREAD SHAPE STANDARD