【Specification】Totally 9pcs/box: 7pcs(16/19/25/35/45/51/65mm) drill bits + 1pc 20mm finger bit + 1pc hex shank adapter. Drill bits: Diameter 19mm-51mm, 5/8-11 thread, total length 75mm,diamond height 15mm. All drill bits are produced by vacuum brazed technology. Finger bit: Diameter 20mm, 5/8-11 thread, total length: 65mm. Workable length 50MM, Grit #50/60. Hex adapter: 5/8"-11 male thread to 3/8" hexagon shank. Adapter change 5/8 Inch-11 thread to 3/8-Inch hexagon shank can allow your bits to fit a wider range of machines. 【Multifunction】Drills Bits for dry or wet drilling holes; Finger Bits for grinding,enlarging or shaping holes. Applicable material: porcelain tiles, ceramic tiles, marble,granite, masonry,marble,concrete,etc. 【Durable and Sturdy】Vacuum brazing technology makes the diamond firmly bonded to the matrix, and the diamond exposure is higher, the processing efficiency is higher, and the service life is longer 【Good work effect】High quality diamond provide fast and smooth drilling. Less chipping, minimizing breakage, less heat generation and better finish quality. 【Easy to use】Recommended machine: Angle Grinder. Recommended RPM 6000. Maximum RPM 11000. ---------------------Description------------------------------- Product Name:DT-DIATOOL Vacuum Brazed Diamond Drilling Core Bits Hole Saw with 5/8-11 Arbor for Porcelain Tile Granite Quantity: 8pcs(including 5pcs drill bits+1pc finger bit+ 2 pcs different adapter) Specification: Drill bits: Diameter 19mm-51mm, 5/8-11 thread, total length 75mm(3 Inch);diamond height 15mm. Finger bit: Diameter 20mm, 5/8-11 thread, total length: 65mm. Workable length 50MM, Grit #50/60. Hex adapter: 5/8"-11 male thread, 3/8" hexagon shank; M14 adapter: 5/8-11 male thread to M14 female thread; Feature: 1.Dry or wet drilling. 2.Less Chipping, Minimizing breakage, less heat generation, Better finish quality. 3.High diamond exposure rate provides a faster and more aggressive drilling 4.Vacuum Brazed technology provides longer working life than electroplated ones (Generally 3-5times). 5.Fast and smooth drilling saves your money and time.