Micro 100 QZST-522L-SR20 Boring & Grooving Bar Holders; Inside Diameter (Inch): 5/16 ; Inside Diameter (Decimal Inch): 0.3125 ; Outside Diameter (Decimal Inch - 4 Decimals): 22.0000 ; Overall Length (Decimal Inch): 3.0000 ; Overall Length (Inch): 3 ;