Three-piece Diamond Core Drill Bit

1.Three-piece Diamond Core Drill Introduction Three-piece diamond core drill is separated, including drilling head(with diamond segments), extension rod and adaptor. It's laser welded diamond core drill. Three-piece diamond core drill have the common charactoristcs, fast drilling, long drilling life and high efficiency. The oustanding feature is you can drill whatever depth that you wanna drill, just by adding extension rods. Diameters range covers 1 inch to 20 inches.  2.Three-piece diamond core drill bit specification Diameter: 1 inch to 20 inches Segments height: 10mm Adaptor: 1 1/4''UNC Item No. Diameter Core Bit Length Steel Tube Length Adapter Length Total Length Barrel Thickness CTCD02509 1" 50mm 300mm 100mm 420mm 2.6mm CTCD03209 1-1/4" 55mm 300mm 100mm 415mm 2.6mm CTCD03809 1-1/2" 65mm 300mm 100mm 405mm 2.6mm CTCD05109 2" 65mm 300mm 100mm 405mm 2.6mm CTCD06209 2-1/2" 70mm 300mm 100mm 410mm 2.6mm CTCD07509 3" 70mm 300mm 100mm 410mm 2.6mm CTCD08809 3-1/2" 70mm 300mm 100mm 410mm 2.6mm CTCD10809 4" 100mm 300mm 100mm 440mm 3.0mm CTCD12609 5" 120mm 300mm 100mm 460mm 3.0mm CTCD15809 6" 120mm 300mm 100mm 460mm 3.0mm CTCD17809 7" 120mm 300mm 100mm 460mm 3.0mm CTCD20309 8" 120mm 300mm 100mm 460mm 4.0mm CTCD22809 9" 120mm 300mm 100mm 460mm 4.0mm CTCD25209 10" 120mm 300mm 100mm 460mm 4.0mm CTCD30009 12" 120mm 300mm 100mm 460mm 4.0mm CTCD35009 14" 120mm 300mm 100mm 460mm 4.0mm CTCD40009 16" 120mm 300mm 100mm 460mm 4.0mm CTCD45009