Diameter: #31 (.1200) Flute Length: 10.50mm AOL: 38.00mm (1.50") Shank: 3.175mm (.1250") Ring Set: .800" Qty: (1) 10pc pack These drill bits are made of 100% micro-grain tungsten carbide 10WS31-1050FL$21.25 Call: 847-419-1267              Fax: 847-419-1241              Email: Drills2001@aol.com