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FastReam Cutter Blocks work with the FastReam housing to cut up to 12” diameter for direct pullbacks.
Short Answer: The "M" Indicates a male connection. This is also sometimes referred to as a "pin" connection.
Correct use: "M" connection tooling, or male connections shoud always mate up to a female (F) connection.
Technical details: When configuring tooling connections, be mindful of the gender of the tooling you are connecting to. Connection size and gender are main factors when configuring tooling connections. Avoid excessive adapter use to limit failure points in your drill string.