Features: 1. For Valve Clearances: These valve spanners are used on scooter engine tappet adjusting systems. Reliable valve adjustment tool to check/adjust screw-type valve clearances for GY6 Scooters, Kawasaki Z125 engines, SSR Pit Bike & more ATVs, scooters, and Karts 2. Advantage: 3mm Valve Tappet Adjuster and 9mm Adjusting Screw Spanner.Allows precise valve lash adjustment without disturbing the setting when the lock nut is fastened. Decrease the cumbersome tools, and get your adjusting job done much faster 3. Knurled Knob Adjuster: 3-mm knurled knob head upgraded made, to ensure a precise and secure grip. The new adjuster driver’s heads are heat-treated and chrome-plated for durability .