Chrome. This is a 500 series steering box for the 1955-57 Chevrolet models. The 500 series box has a bolt on cap that allows zero movement and a dependable leak free seal. The mounting bosses are integrated into the casting, which eliminates the need for an external bracket. This will also line up perfectly to your column without shims. The specifications are 14:1 ratio, with an input shaft:3/4"-30 spline, sector shaft: 1" 36-4 tapered spline, pressure fitting: 7/16 tube, and return tube: 3/8 tube. This will also work with the 605 conversion rag joint