FDL Piston Ring Gauge and Micrometer Standard - for 9.000" Bore

This tool has a 9.000 inch bore and is useful to measure piston ring wear (gap). A slot in the side of the box allows entrance of feeler gauges to measure the gap. Also, zeroing the cylinder liner bore gauge is accommodated by the 9.000" bore. Cylinder liner wear can be measured in this manner.