The Mack 3 Hole Hub Adapter is a practical and reliable solution for Mack truck owners. Available in black and with a 36 spline count, this adapter fits most Mack trucks from 1951 through May of 2001, as well as most sleeper cab Mack models from May 2001 and newer. Sold individually, this adapter is a must-have for those looking to upgrade their Mack truck's hub. Its durability and compatibility make it a smart investment for any Mack truck owner.