Auto-Guide hole saw arbor anchors and aligns for improved drilling. An extra strong spring increases tension for added stability and prevents surface "skating". The 1 3/8 inch retracting guide pin allows you to drill deeper and through thicker material. The Auto-Guide carbide drill tip penetrates surface for improved anchor and drill guide. • Heavy duty one piece construction • Eliminates pilot drilling • Improved strength, durability and extended life • Improved tension and drilling stability • Features the 5/8-18 industry standard thread for hole saw compatibility • Fits 3/8 in. or 1/2 in. drills
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