1/2-20UNF x 2 " press in trailer wheel bolt, yellow zinc plating, standard trailer wheel bolt for US/Canada market TRALER WHEEL BOLT/ STUDMaterial : high strength steel Zinc finish ( yellow zinc plating )Stud Grade : US standard Grade 8 wheel bolt key dimensions: overall length 2 inch, thread length 1.130 inch, thread :1/2-20 UNF, insert length 0.380 inch, cap diameter 3/4 inch, knurl diameter 0. ...