Product Name: Vacuum Brazed Diamond Drill Core Bits Quantity: 1 piece only Specification: 5/8-11 Female Thread (That is very important for your machine) Available Diameter: From 6MM to 152MM Total Length: 62MM (diameter 6-16MM), or 75MM (diameter >=19MM) Machine: Angle Grinder... Feature: Wide Application for Porcelain tile granite marble stone masonry brick... Vacuum Brazed technology provide much longer working life than electroplated technology High quality Diamond Grain provide fast and smooth drilling Minimizing any breakage and safe for operator