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Contact SupplierCore drill barrel These are core drill tubes, core drill tube is made of standard steel tubes, and make it into requested thickness by lathing processing. The adaptor of core drill barrel is welded by a tube and connections. The three parts are connected by a thread, which has the opposite direction with the drilling direction. In this case, these parts can be fastening tightly during the drilling operation, which can keep it safe for workers. Common sizes of the core drill barrels are 1 inch to 20 inches. Our main product ranges include Diamond saw blade and cup wheel, Diamond wire and core drill bits. Detailed data are as below:    Diameter      Diameter     Thickness 1" Ф25.7 2.6mm 1-1/4" Ф31.3 2.6mm 1-1/2" Ф38.7 2.6mm 2" Ф50.8 2.6mm 2-1/2" Ф62.4 2.6mm 3" Ф75.2 2.6mm 3-1/2" Ф87.77 2.6mm 4" Ф108 3.0mm 5" Ф126 3.0mm 6" Ф158 3.0mm 7" Ф178 3.0mm 8" Ф203 4.0mm 9" Ф228 4.0mm 10" Ф252 4.0mm 12" Ф303 4.0mm 14" Ф353 4.0mm 16" Ф404 4.0mm 18" Ф455 4.0mm