Check the listing for details. Hinge Boring Forstner Drill Bits 24mm Diameter 7mm Round Shank. Condition: New. Listed at 12.32 USD. 1. Forstner Bit drill clean holes in soft and hard wood.2. Two spurs and centering point to give the perfect solution to repeated, clean and accurate hole cutting time after time.3. The sharp center spur accurately locates the center of your hole.4. Use to drill precise flat bottom holes with no chipping in any thickness of soft wood.5. For drilling holes in any direction and making arched openings. For drilling partially overlapped flat bottom holes for easy mortising.6. Should be use with bench drill, vertical drilling machine, CNC carving machine. Tips: Maximum speed: 2000rpm. Used on desktop (fixed) equipment, and can NOT be used on handheld power tools (such as hand drill or electric drill). Can not drill metal and non-ferrous metal. To avoid causing damage, be sure no nails or other metal objects in wood before drilling.