MEDIUM-DUTY 5 in PLATE CASTER WITH BRAKE;CASTR BRAKE: YES;CASTR TYPE: SWIVEL;COLOR: BLACK WHEEL AND HUB;LOAD CAPACITY: 544 KG PER SET OF 4, 1200 LB PER SET OF 4;LOAD HEGHT: 6-1/4in, 159 MM;MATERIAL(S): POLYOLEFIN WHEEL AND HUB;MOUNTING PLATE SIZE: 2-3/8in X 3-5/8in;MOUNTING TYPE: PLATE;PROP 65 WARNING:;THIS PRODUCT CAN EXPOSE YOU TO CHEMICALS INCLUDING URETHANE;(ETHYL CARBAMATE), WHICH ARE KNOWN TO THE STATE OF CALIFORNIA TO;CAUSE CANCER AND BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.;SCREW CENTERS: 1-3/4in, 3in, 44 MM, 73 MM