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....