Dewalt, Dw5820, Masonry Drilling, Drilling Accessories, Hammer Drill Bits, Na 1" X 31" X 36" 4 Cutter Sds Max Rotary Hammer Bit The Dewalt 1" X 31" X 36" 4 Cutter Sds Max Rotary Hammer Bit Is An Extremely Durable And Useful Attachment. Use This To Increase Your Efficiency And Decrease Your Work Time. Superior Build Quality Means You Will Be Using This Bit For Years With Minimal Wear And Tear. A Must Have For Any Professional Or Do-It-Yourselfer. Features: Rock Carbide Tip Maximizes Carbide Surface Contact For Longer Bit Life - Open Head Design Channels Dust Into Flutes For Quicker Drilling - Longer Helix Four Flute Design Expedites Mill Removal For Quicker Drilling - Specifications: Diameter: 1" - Usable Length: 31" - Overall Length: 36" - Dewalt Is Firmly Committed To Being The Best In The Business, And This Commitment To Being Number One Extends To Everything They Do, From Product Design And Engineering To Manufacturing And Service.