Valve Stem Seal Install Tool SetContoured design in bottom of handle cradles and protects the delicate inner lip of the valve stem seal while directing tool force to the sturdy outer rimSet of 4 (4 mm, 4.5 mm, 5 mm, 5.5 mm) for use on most modern off-road motorcycles as well as ATVsSlim profile allows easy access to valve guides even on modern compact heads with deep lifter boresProvides for quick and easy installation of valve stem seals on multi valve cylindersProperly aligns valve stem seal to valve guide so seal snaps on straight every timeRounded tip will not damage inner lip of valve stem seal or valve guide boreAnodized aluminum handles with stainless steel pilot shaftsLifetime limited warranty