Core Bits Kit(F965K3) Contains: 5 pieces(25/35/51/65/102mm) drill bits, 1 piece 25mm milling bit; total 6 pieces/box The thread of all diamond bits are 5/8"-11,recommended machine angle grinder All bits are produced in Vacuum Brazed technology, which could provide longer working life, Fast and smooth drilling Core bits are designed for drill Porcelain Tile Granite Marble Masonry Brick and all similar materials Diamond milling bit is used for Enlarging, shaping and/or rounding bevel existing holes in Porcelain, Hard Ceramic, marble and granite Product Name: FACHLICH F965K3 6 pieces/box Diamond Hole Saw Core Drill Bits Kit Specification: Core bits: Diameter 25/35/51/65/102mm, 5/8-11 thread, Total Length 75MM, Diamond height 15mm Milling bits: Diameter 25mm, 5/8-11 thread, Total Length: 65mm, 50MM workable length,Grit #50/60 Quantity: 6 pieces(including 5 pieces core bits, 1 piece milling bit for using) and a big box for storaging Application: For drilling porcelain tile granite marble stone masonry brick..... Feature: Dry or wet drilling Less Chipping, Minimizing breakage, less heat generation, Better finish quality High diamond exposure rate provides a faster and more aggressive drilling Vacuum Brazed technology provides longer working life, Fast and smooth drilling Vacuum Brazed technology provide much longer working life than electroplated ones (Generally 3-5times),Save your money and time....