ZINC PLATED; 1/2" DIAMETER HRC 45 STEEL BALL BEARINGS WITH STAND SHOCK LOADING IN SEVERE ENVIROMENTS;GREASE FITTINGS IN SWIVEL RACEWAY;3/4"AXLE WITH LOCK NUT; Wheel DiaTread WidthLoad HeightSwivel RadiusPlate SizeBolt SizeCapacity Each(kg)6"2 1/2"7 1/24 3/46 1/2 ×4 1/24 15/16 ×3 3/8 OR 5 1/4 ×2 7/16250-1800KG3"310-2000KG8"2 1/2"10 1/86 9/16300-2000KG3"380-2000KG10"2 1/2"11 1/27 5/8360-2000KG3"450-2000KG12"2 1/2"13 1/29 1/8430-2000KG3"520-2000KGSTELL THICKNESS-3/8";1/2"STELL BALL