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Description:Diamond Hollow Core Drill Bit
1.Material:steel with diamond segment
2.Size:Outer Diameter:11-162mm(0.87"-6.38")
Arbor Size:170mm(6.69"),350mm(13.78")
3.Procession:cold press,high frequence,laser welding
4.Package:plastic tube,white paper box,color paper box.
5.Bits set is available.



