threaded shank adapter drill
Threaded Shank Adapter Drills are used for drilling materials in confined areas. They are manufactured with true concentricity for more accurate holes. They are often referred to as Snake Drills.
Type "B" page 125A
Type "B" HSS Threaded Shank Adapter Drills are for medium duty drilling in low tensile strength materials.
Type "D" page 125B
Type "D" Cobalt Threaded Shank Adapter Drills are used for heavy duty drilling in hard, tough tensile strength materials.