Product Details: The CRITERION boring head shank extension effectively extends the reach for deep hole boring beyond standard setup depths. Its precision ground shank ensures minimal runout, enabling accurate bore diameter control. The rigid construction reduces chatter and vibration during high speed operations. Mounting directly between the machine spindle and boring head, it provides secure tool assembly. Hardened steel construction resists deformation under heavy radial loads, while close tolerance grinding ensures consistent concentricity across repeated setups.