For Cummins ISX engine brake adjustment, alternative to 3163530 Jake Brake Tool (7MM) feeler gauge. The 7mm section is precision ground to +/- .0005 inch tolerance. Insert a 3163530 feeler gauge between the slave piston contact surface and the exhaust valve adjusting screw. The feeler gauge must be inserted from the sides to clear the slave bridge. Lash adjustment must be performed on both slave piston adjusting screws on each cylinder. Machined from high-quality steel with an anodized black finish for corrosion resistance and long-term durability. Provides a fast, easy, and accurate method to check valve clearance. Proper clearance adjustment is essential for optimal engine performance and to help prevent mechanical failures. Function: Helps reduce engine noise and maintains engine performance. Color: Black Material: Steel Size: 7.0MM Package Contents: 1 x Engine Adjustment Tool Note: The package includes only the items listed above. Other products are not included. Lighting and monitor settings may cause slight variations in the color as shown in the image. Measurement may vary by +/- 1-3cm due to manual measurement.