![Micro 100 QT-312-C4 Boring & Grooving Bar Holders; Inside Diameter (Inch): 5/16 ; Inside Diameter (Decimal Inch): 0.3125 ; Outside Diameter (Decimal Inch - 4 Decimals): 1.5748 ; Overall Length (Decimal Inch): 3.0411 ; Head Diameter (Decimal Inch): 0. Micro 100 QT-312-C4 Boring & Grooving Bar Holders; Inside Diameter (Inch): 5/16 ; Inside Diameter (Decimal Inch): 0.3125 ; Outside Diameter (Decimal Inch - 4 Decimals): 1.5748 ; Overall Length (Decimal Inch): 3.0411 ; Head Diameter (Decimal Inch): 0.](https://cdn11.bigcommerce.com/s-rerso7mgzy/images/stencil/640x640/products/1253993/1343171/0529501-21__15164.1717110951.jpg?c=1)
Micro 100 QT-312-C4 Boring & Grooving Bar Holders; Inside Diameter (Inch): 5/16 ; Inside Diameter (Decimal Inch): 0.3125 ; Outside Diameter (Decimal Inch - 4 Decimals): 1.5748 ; Overall Length (Decimal Inch): 3.0411 ; Head Diameter (Decimal Inch): 0.