GENERAL PURPOSE THREADED STEM CASTER, SWIVEL CASTER, 275 LB LOAD RATING, 0 TO 299 LB, 4 IN WHEEL DIA., 1 1/4 IN WHEEL WIDTH, POLYOLEFIN WHEEL/TREAD MATERIAL, 5 IN MOUNTING HEIGHT, PLAIN, 3/8 IN.-16 X 1-1/2 IN CASTER STEM SIZE, THREADED, STEEL CASTER FRAME MATERIAL, ZINC PLATED FRAME FINISH, YES NON-MARKING, 1 NUMBER OF WHEELS