The Carrymaster ACTM series are light duty casters with low profile design. ACTM comes in two models. ACTM-400 Swivel comes with two wheels. ACTM-Rigid comes with twin wheels and it is a non-swivel caster. ACTM series are made only in plate/flange (F type). The load capacity is 441lbs per caster and the wheel size is 22mm. The metal frame of ACTM-400 Swivel is aluminum diecast with powder coat & zinc galvanized finish and the ACTM- 400 Ridged comes in SPC zinc galvanized finish. The default wheel is made out of Polyurethane(PA6 material, Black).