FREE SHIP United States Its arbor is 5/8″-11 Female Thread. Product Name: 1pc Vacuum Brazed Diamond Chamfer Milling Bits For Enlarging, Polishing and Bevelling The Exist HolesSpecification: Material: DiamondDia 35mm 1- 3/8″: Working length 35mm; Grit #50;Connector：5/8-11 thread; (NOTE: 5/8-11 Female Thread arbor) Features:1. Cutting edge high-end vacuum brazing process provides better performance and longer service life for the product;2. The #80 fine-grained diamond, through fine grinding, can produce excellent surface effect on the edge of the hole, smooth and clean; 3. Bevel Ease chamfers and stress relieves rough holes in glass, ceramic and porcelain tiles;4. Reduce the risk of cracking with standard and large format tiles subjected to tension (eg tightened plumbing, led lights etc); 5. It is very useful to improve aesthetic degree for the edge finishing of exposed holes.6. Can be used wet or dry.NOTE :This is not a core bit for drilling. It doesn’t make holes but it bevels the hole cleaning and reinforcing the borders when the borders are chipped or need to be clean.