Hilti 2025591 7/8-Inch x 6-Inch High Speed Wood Spade Bits, 3-Pack Self-feeding threaded tip allows drilling with less effort and reduces vibration Spur and reamer edges create cleaner holes Wing tips and cupped spade increase speed and ease of drilling Connection end with hex shank groove for use with all SID, SFH and SF power tools High-speed spade bit for fast drilling progress