Install, remove, and compress your vehicle’s valve spring without having to meticulously remove the cylinder head from the engine with the ABN Automotive Engine Overhead Valve Spring Tool Set. This kit can be used on overhead valves (OHV) and overhead camshaft (OHC) gasoline or diesel engines. The base bolts into the head while the lever mechanism pivots from the bar to compress the spring. The piece that slides onto the handle has 2 holes to use depending on your needs, and the multiple holes on the bracket allow for compression arm adjustments. Large openings on both sides of the compression tube allow for removal and installation of a spring retaining keeper. Also included are both common size spark plug hole air fittings for hooking compressed air directly to the cylinder. WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.