Thermosetting resin solid wheels, swivel top plate bracket type NL Wheel description High temperature solid thermosetting resin wheel. Plain bearing bore The plain bearing bore results from a hole in the material forming the centre of the wheel and contains the axle. Axle Axle composed of ground steel bush with bolt according to UNI EN 24017 and nut according to UNI EN 24032. Swivel top plate bracket NL Swivel top plate bracket type NL. The plate, the ball race ring and the fork are made of pressed steel zinc plated finish; swivel actions: double ball greased race. The king pin is integral with top plate and duly rivetted.