This package includes two GM 90473457 wheel stud bolts, suitable for use on 1997-2001 Catera 2008-2009 Astra BMW E21 E30 models. The bolts are made of durable carbon steel and have a rust-resistant coating, making them suitable for outdoor use. They are easy to install and come with a lug bolt design. The thread size is 12x1.5mm, and the bolts are compatible with interchange part numbers 610-367.1 and 4709077. The package does not include any manufacturer warranty, but the bolts are made in Italy and are not intended for universal fitment. They are a vintage part and are suitable for use on the lower, rear, left, front, and right of the vehicle. The finish is zinc plated, and the bolts are not considered a performance part.