Ball Bearing "V" Block

...Overcomes Production or Set-Up Difficulties Inherent in Plain V-Blocks. Overcomes Geometric Limitations. Enables you to inspect and detect out-of-round conditions and lobes with no damage to parts and no damage to blocks Sold without clamps. Complete with Test Ball. Features Accuracy of Balls: 25 millionth of an inch sphericity on small and medium set. 50 millionths of an inch on large set. Overall accuracy of matched pairs +/-5 microns. Balls Rockwell C-62 - Surface finish 0.2 microinches. Calibrated balls are certified. Class 40 cast iron, used on base and housing, is heat stabilized and seasoned. Spacers are hardened through and precision ground by pairs. Pair of blocks assembled using metrology equipment. Dimensions Available in 3 sizes with ranges of: 3/64" - 2 1/2"; 3/22"-5"; 3/16"-15". Sold in matched pairs complete with clamps (for use when machining).   Functions Balls undergo slight elastic deformation when parts are loaded on. Hence parts will not be damaged while be