IRWIN Marples 2 1 8 in Woodboring Forstner Drill Bit Air Compressors and felt to wood roof 1000711670 and felt to wood roof decks Not Recommended For Treated lumber or applications where surface rust is unacceptable Package Weight 50 lb Frequently Asked Questions (FAQ): A: Undermount (under counter) installation 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 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