Colson
2 Series Threaded Stem Zinc Swivel Caster with 3.5 x 1.3125 Grey on Black Performa Rubber (Round/Conductive) Wheel and Top Lock Brake
Threaded Stem
1/2"-20UNF x 3/4" (MTG12) with 210
3.5x1.3125
Conductive Rubber