• upper and lower kelly valves,
• square and hexagon kellys,
• drill-setem subs,
• drill collars,
• drillng and coring bits

Rotary shouldered connections and gauging for drill stem elements are covered in API Spec 7-2.

This edition of API Spec 7-1 is the modified national adoption of ISO 10424-1, Petroleum and natural gas industries-Rotary drilling equipment-Part 1: Rotary Drill stem elements. This specification contains the API Monogram Annex as part of the U.S. national adoption.