1For ISX engine for brake adjustment, alternative to 3163530 Jake Brake (7MM) feeler gauge. The 7mm area is precision ground to +/- .0005 inch. 2Insert a 3163530 feeler gauge between the slave pistons contact surface with the exhaust valve adjusting screw. The feeler gauge must be inserted from the sides to clear the slave bridge. 3The lash adjustment must be performed on both slave piston adjusting screws on each cylinder. 4Machined from high standard steel anodized black finish, anti-rust, providing a long-term service. 5A fast, easy and accurate way to check the valve clearance with this feeler gauge. Getting the clearance adjusted is important for great performance, avoiding any unwanted failures or engine blows. Function: Useful to keep engine noise down and keep your engine performing to its level. colour: black Material: Steel size: 70MM Package Contents: 1 * Engine Adjustment Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.