The Fowler-Bowers XT Mechanical Bore Gages offer an economical solution to accurate shop floor bore measurement. Fast, accurate and easy-to-use, the wide application range of the XT Analog Bore Gage line may be purchased individually or in sets. Features include... 2" - 4" Measuring Range 0.00025" Graduations 3-pt contact with tungsten carbide measuring anvils above .5" Blind bore measuring above .5" Ratchet stop for consistent measuring Non-removable anvils Extensions available for deep measuring Setting rings included in all sets Includes UKAS certificates for all Holemikes and setting rings Every gage is individually serialized Included in this set are the following items... 2.000" - 2.625" Measuring Head & Handle 2.625" - 3.250" Measuring Head & Handle 3.250" - 4.000" Measuring Head & Handle 2 Setting Rings