DETAILS Dial-Type Gauge Kit precisely measures cylinder bore wear 2″-6″ range 10 pins For most motorcycle and automotive engines Molded storage case Just how much wear has the cylinder bore been subjected to? Measure the severity of this condition with this precision cylinder bore gauge. Don’t rebuild an engine without checking the extent of cylinder bore wear. Cylinder bores wear unevenly due to power stroke crank rotational thrust and ring momentum. These conditions create out-of-round, tapered bores. 2″ to 6″ range suits most motorcycle and automotive engines. 1-year mfr’s. warranty. NOTE: You’ll find locating pin #1 pre-inserted in the tool; pin #11 is not required and therefore not included.