Contoured 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 rim Set of 4 (4 mm, 4.5 mm, 5 mm, 5.5 mm) for use on most modern off-road motorcycles as well as ATVs Slim profile allows easy access to valve guides even on modern compact heads with deep lifter bores Provides for quick and easy installation of valve stem seals on multi valve cylinders Properly aligns valve stem seal to valve guide so seal snaps on straight every time Rounded tip will not damage inner lip of valve stem seal or valve guide bore Anodized aluminum handles with stainless steel pilot shafts Lifetime limited warranty. TOOL VALVE STEM SEAL SET
