Set containing spade drill bits up to 3x faster than a standard drill bit. High speed self-feeding threaded tip draws spade bit into wood with only the lightest pressure from user. Ideal when drilling upside down or in tight niches. Paddle design delivers additional speed. Suitable for softwoods, chipboard or particleboard. Hex shank for maximum power transfer in standard 3-jaw drills and hexagonal screwdriver chucks. Suitable for Natural Hardwood & Softwood, Plywood, Chipboard & Hardboard 12-32mm Dia. Drill Bits High-Speed Steel Self-Feeding Threaded Tip For Use with 3-Jaw & 1/4" Hex Chuck Machines on Rotary Action Suitable for Natural Hardwood & Softwood, Plywood, Chipboard & Hardboard 12-32mm Dia. Drill Bits High-Speed Steel Self-Feeding Threaded Tip For Use with 3-Jaw & 1/4" Hex Chuck Machines on Rotary Action