Product Name: Diamond Grinding Cups for Button Bit Grinder Model NO.: Diamond Grinding Cups for Button Bit Grinder Color: Blue Size: 7-20mm Shank`: 8mm Weight: 0.01kg Trademark: BESTlink Transport Package: Wooden Specification: SGS Origin: China HS Code: 82079010 Product Description BESTlink-------------Diamond grinding pin for DTH button bitOur factory specialize in producing diamond grinding pin. It's a perfect tool for grinding your broken button bits, to prolong it's lifespan. Our grinding cup can be used for grinding 7mm-25mm button size. Other sizes available on request. Except ATLAS model, the others model all can be used for grinding both the bit button and body steel in one operation. The combination grinding pin benefits from a specially developed grinding material capable of grinding both carbide and steel at a regular and consistent rate. Available with a choice of Hemispherical, Ballistic Semi Ballistic, Paraboloid or Conical cups.Advantages:- specially formulated matrix for maximum performance- maintain proper profile time and time again- Strategically positioned flushing outlets for improved flushing and cooling- maximize drilling economy- field proven.For button's diameterΦ7mmΦ8mmΦ9mmΦ10mmΦ11mmΦ12mmΦ13mmΦ14mmΦ15mmΦ16mmΦ17mmΦ18mmΦ19mmΦ20mmFor bit's button shapeFor bit's button size (mm)spherical buttonsballistic buttons6 7 8 9 10 11 12 13 14 15 1617 18 19 20 21 22 23 24 25bit's body steel removal7-8 9-10 11-12 13-14 15-16 17-18 19-20