This TuffLine Meritor Style E11398/R801041 Auto Slack Adjuster features a 1-1/2" 10 spline configuration with 5-1/2" arm length for Type 24 and 30 brake chambers. Engineered for heavy-duty vehicles with air brakes, this slack adjuster automatically maintains proper brake clearance, ensuring consistent braking performance and extended lining life in demanding commercial transportation applications.