87908 Cutting Diam: 1/2", Price Each (part# 87908) This item features: -Patented micro-groove cutting edge and spurs produce a smoother hole finish. -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. -All bits have a 1/4" hex shank that fits all drills and 1/4" quick change adapters. -Length: 4 3/4 in. -Applicable Materials: Wood. -Brand Name: Speedbor . -Type: Boring Bit.