Valve lash adjustment tool Engine Compatibility: Perfect for adjusting valve clearance on Honda, VTEC, Toyota, Nissan, and other Japanese engines.Precise Fit: Designed for valves with a 10mm jam nut and slotted valve adjusting stud.Improved Visibility: Built-in cutaway allows clear view of the screwdriver blade for easy engagement with the valve stud.Enhanced Leverage: The 7-1/2" side handle offers extra leverage to easily loosen tight jam nuts. The socket has a window cutout for easy visibility of the flat screwdriver end, ensuring precise valve stud adjustments while tightening the jam nut. The handle is made of durable, non-slip plastic, ensuring a secure and comfortable grip during use. The 7-1/2" adjustment handle provides ample leverage for loosening tight jam nuts.