Single Piece Forged Alloy Steel Top Plate with an Integrally Forged Kingpin & Forged Fork Base Combinition of Precision Thrust Bearing and Tapered Roller Bearing in the Swivel Head Totally Sealed Swivel Head with grease nipple Finish:Zinc Plated;ROSH Compliant or Black Polymer Colour coated Options:4 way Directional Lock