What type of connectors does this extension cable have?

This extension cable has a 9-pin DB-9 Male connector on one end and a 9-pin DB-9 Female connector on the other end.

What is the length of the C2G 52030 DB9 M/F Serial RS232 Extension Cable?

The length of the cable is 6 feet or 1.82 meters.

Yes it does. Simply remove the nuts by twisting them off.

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C2G 52030 DB9 M/F Serial RS232 Extension Cable, Black (6 Feet, 1.82 Meters)

Extend your RS-232 serial cable for more flexibility
Extend an existing DB9 cable up to 50ft
Each extension cable comes fully shielded to prevent unwanted EMI/RFI interference
Fully molded cable design delivers excellent strain relief
All lines are wired straight through