IRWIN Marples 2 1 8 in Woodboring Forstner Drill Bit Armstrong Flooring ) 90 Maximum Pressure (psi) ) 90 Maximum Pressure (psi) 225 Air Delivery SCFM @ 90PSI 5 Features heavy duty construction for durability and tensioned spring clamps for easy paper changes Series Name N A Sub Brand Marples Bit Type Forstner bit Bit Length 3 11 16 in Shank Size 3 8 in Shank Type Round Material High speed steel Case Type N A (no case) Quick Change No For Use With Power tool For Use on Metal No For Use on Wood Yes Warranty None Set Individual Individual Package Quantity 1 CA Residents: Prop 65 Warning(s) Yes Brand Model Compatibility All Bit Diameter (Inches) 2 1 8 in IRWIN Marples Forstner bits drill clean and precise flat bottomed holes and pocket holes quickly and easily Teeth designed for clean holes Cutting angles maximize speed of cut Reduced shank fits 3 8 in and larger drills and drill presses