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Easy to use Speed Valve Lapping Tool! Universal as it comes with differen size lock springs, which would open up slightly larger to fit most common size valves for engines. Once the spring is paired with the valve, the drill chuck would attached to the spring pin, which would allow you to use the drill and speed up the valve seating/lapping process! The old method was using the "stick" lapping tool, which the stick tool would spin in-between both hands in a fire starting motion. WIth the speed Valve Lapping Tool, you no longer need to do that!
Comes included with extra replacement lock springs. Perfect for engine builders!