585-87910 Features: -Double spur design scribes the hole before the chips are made, producing a cleaner hole and reducing vibration.-Shorter bit length gets into confined spaces (between studs) where standard lengths will not fit.-Applicable Materials: Wood.-Brand Name: Speedbor.-Type: Boring Bit. Color/Finish: -Patented micro-groove cutting edge and spurs produce a smoother hole finish. Dimensions: -All bits have a 1/4'' hex shank that fits all drills and 1/4'' quick change adapters.-Length: 4 3/4 in.