CMT 317.240.12 Hinge Boring Bit 24 x 57.5mm LH U Face Mount Joist Hanger Cutting Height provides adequate Cutting Height provides adequate depth of engagement for through dovetails and sliding dovetails in typical stock thicknesses without overloading the bit Code compliant standoff protection the 1 in The combination of negatively ground spurs and HW precision ground cutting edges addresses two common failure points in panel boring tear out at the entry perimeter and rough bore bottoms delivering cleaner results in veneered and laminated materials Parallel Shank with Driving Flat and Length Adjusting Screw the 10x26mm shank with driving flat and integrated length adjusting screw ensures secure tool retention and precise depth setting in adaptors or chucks