Check the listing for details. Tramec E-10779A Automatic Slack Adjuster 5.5” Arm 28 Spline. Condition: New other (see details). Listed at 68.75 USD. This Tramec E-10779A Automatic Slack Adjuster is a top-quality unit that is designed to ensure your commercial truck's braking system is always in top performance. With a 5.5" arm and 28 splines, this unit is perfect for trucks with high demands and heavy loads. It comes with a 60-day warranty, giving you peace of mind that you are getting a reliable and durable product. This unit is manufactured by Tramec, a trusted brand in the commercial truck parts industry. It is easy to install and use, making it a great choice for truck owners who want to keep their vehicles running smoothly. Whether you are looking to upgrade your truck's braking system or simply need a replacement part, this automatic slack adjustor is an excellent choice. Manufacturer colors may vary between red and blue