![Micro 100 QTHM-520 Boring & Grooving Bar Holders; Inside Diameter (Inch): 5/16 ; Inside Diameter (Decimal Inch): 0.3125 ; Outside Diameter (Decimal Inch - 4 Decimals): 20.0000 ; Overall Length (Decimal Inch): 2.8000 ; Head Diameter (Decimal Inch): 0. Micro 100 QTHM-520 Boring & Grooving Bar Holders; Inside Diameter (Inch): 5/16 ; Inside Diameter (Decimal Inch): 0.3125 ; Outside Diameter (Decimal Inch - 4 Decimals): 20.0000 ; Overall Length (Decimal Inch): 2.8000 ; Head Diameter (Decimal Inch): 0.](https://cdn11.bigcommerce.com/s-rerso7mgzy/images/stencil/640x640/products/2582167/2740579/1530792-21__01121.1717279296.jpg?c=1)
Micro 100 QTHM-520 Boring & Grooving Bar Holders; Inside Diameter (Inch): 5/16 ; Inside Diameter (Decimal Inch): 0.3125 ; Outside Diameter (Decimal Inch - 4 Decimals): 20.0000 ; Overall Length (Decimal Inch): 2.8000 ; Head Diameter (Decimal Inch): 0.