Micro 100 QZST-322-SR20 Boring & Grooving Bar Holders; Inside Diameter (Inch): 3/16 ; Inside Diameter (Decimal Inch): 0.1875 ; Outside Diameter (Decimal Inch - 4 Decimals): 22.0000 ; Overall Length (Decimal Inch): 2.3840 ; Series: QZST ; Manufacturer