1 Forstner Bit drill clean holes in soft and hard wood2 Two spurs and centering point to give the perfect solution to repeated clean and accurate hole cutting time after time3 The sharp center spur accurately locates the center of your hole4 Use to drill precise flat bottom holes with no chipping in any thickness of soft wood5 For drilling holes in any direction and making arched openings For drilling partially overlapped flat bottom holes for easy mortising6 Should be use with bench drill vertical drilling machine CNC carving machine Tips: Maximum speed: 1200rpm 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 The cutting edge and tip of the opener should be sharpened in time Specification:Cutting Diameter: 95mm / 374 inchShank Diameter: 12mm / 047 inchShank Length: 28mm / 11 inchTotal Length: 88mm / 346 inchFeeding Speed suggested: 8-12M/MinSpindle Speedsuggested: 18000-24000RPMTip Material: Tungsten CarbideBody Material: Carbon SteelPackage Content: 1 x Forstner BitWeight: 365g; Main Color: GrayBlue Please Note:1When drilling holes forstner drill bit is made only in the clockwise direction not reversible and the speeds from low to high is a gradual process2Please grind the tool nose and tips to avoid ageing and damage when breaking; or it will cause a steep decrease in accuracy and quality for drilling holes after tips break