Screw - Tappet Tool - Oil Filter - O-ring design retains the tool in wrench or socket while flange design allows downward force to be applied to tool - Designed for use with 7/16" combination wrench to allow for maximum rotation without touching engine cases - For use on big twin (excluding twin cam) with slotted screw tappet oil filter screen cover - Can be used without removing exhaust pipes on most bikes - Tappets should be serviced every oil change