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Long Shank TCT Drill Bits SDS Masonry Drills with carbide tips Quick detail 1:Long shank, the longest is more than 1000mm 2. Tungsten carbide tips hardness HRA89-HRA91.5 3. 45# carbon steel body with heat treatment. Avoid breaking. 4. Brazed high frequency induction brazing makes sure the strength of the teeth to prevent carbide breakage. 5. Special Helical cutting angle . Design for concrete cutting. 6: sand blash processing surface. Drill bits made of carbon steel and