NSF-LISTED SANITARY THREADED STEM CASTER, SWIVEL CASTER, 350 LB LOAD RATING, 300 TO 999 LB, 3 IN WHEEL DIA., 1 3/4 IN WHEEL WIDTH, POLYOLEFIN WHEEL/TREAD MATERIAL, 3 7/8 IN MOUNTING HEIGHT, PRECISION BALL, 1/2 IN.-13 X 2-1/2 IN CASTER STEM SIZE, THREADED, STEEL CASTER FRAME MATERIAL, ZINC PLATED FRAME FINISH, YES NON-MARKING, 1 NUMBER OF WHEELS