The Starrett 666 Series Thickness Gauge or Feeler Stock, Model 666 comes in a plastic dispenser case. This handy product Series is housed in a convenient rewindable dispenser roll. Having the thickness stock in a case makes it very useful for cutting off the required length for adjusting tappets, spark plugs, distributor points, checking bearing clearances and gear play, fitting pistons, rings and pins, gauging narrow slots, etc. This stock is also useful for shimming in fixturing and die work.