Sub Adaptors for HydraDrill drill steel threads. Connect your drill bits (Tri Cone or drag Bits) to your HydraDrill drill stems with out having to weld on the drill bit to the drill stem. Change drill bits when ever you want to with out discarding a drill stem.

 Sub adaptors allo you to interchange sizes of drill bits to your drill stem.

 sub Adaptor Size : 2 3/8" A.P.I. Box to 11.5 thread Box (hydradrill stem thread. )