Dynabrade 95745 1/4" NPT Speed Regulator 
Insize 7351-1EX21, LONG HANDLE, length 18.7″, 6928640357275
$207.09
Applicable bore gages 6 – 10″, 10 – 16″
To assist deep-hole measurement.
Can be used for bore gages 2323, 2123, 2824 and 2827.
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