I have a Montgomery Wards masonary carbide drill bit set 1/4"-3/4". The bits include: 1/4"-, 5/16"-,3/8",-1/2",-3/4", the 1/4" & 5/16" bits have been used the rest appear to have never seen any action. Call Tux @ 651 7zero7 6920 I Forgot to mention these bits were made in the U.S.A.