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Description: LAVIE 9/10pcs Hole Saw Drilling 4/5/5.5/6/6.5/7/8/10/12/14*110mm/160mm Electric Hammer Drill Bits for Wall Concrete Brick Masonry Specifications:Type Impact Drill BitModel DB01004Material 40CR Body & Original Carbide Tip YG8CDrill body hardness HRC45 to HRC48Carbide Hardness HRC89.5..