These Mirco 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. 5pc New Fractional Packs 10pc New Fractional Packs Call: 847-419-1267              Fax: 847-419-1241              Email: Drills2001@aol.com