This pack contains 5pcs of 1/4 (.2500). These new micro drill bits are made of Tungsten Carbide. The over all length is 1.50". The shanks have a diameter of .1250 and all have identification rings on them. 05F2500$43.90 Call: 847-419-1267              Fax: 847-419-1241              Email: Drills2001@aol.com