Gunson G4095 Eezilap Valve Lapper

Zoro Tools

This simple tool fits into a standard electric drill chuck and quickly and effectively grinds valves in seconds. Kit contains a 22/28mm sucker head which fits mostFits all power drills with 5/16" (8mm) chuck Essential on multi-valve engines

Amazon

Kit contains a 22/28 mm sucker head which fits most Fits all power drills with 5/16 Inch (8 mm) chuck Essential on multi-valve engines