Product Details: The Haldex 6" Self-Setting Automatic Brake Adjuster is designed to provide reliable and consistent performance in the most demanding applications. This brake adjuster is made of high alloy steel for greater strength and wear resistance, and features a 1-1/2" - 28 spline diameter and a 6" arm length with a 1/2" arm hole diameter. The self-setting automatic brake adjuster feature simplifies installation and ensures consistent performance. FleetPride is your First Click in Heavy Duty®.