Blackburn FBS4H215A1-28 4H JMPR BRD 2150 H9/16x2 L28

The FBS4H215A1-28 flexible jumper braid measures 28 inches (711.2 mm) overall, which is the -28 in the part number. That length is fixed, so measure your terminal-to-terminal run plus enough slack for the movement or vibration the braid is there to absorb before you commit to it.

Not if your run is not close to 28 inches. The FBS4H215A1-28 is a fixed 28 inch braid, and the trailing number in the Blackburn FBS part number is the length. Look for the same series with the length suffix that matches your joint instead of trying to stretch or double back this one, since folding a braid defeats the flex it is there to provide.

It is a grounding and bonding device: a flat flexible braided conductor used to carry bonding continuity across a joint that moves. Typical uses are across expansion or vibration points, between a moving frame or door and a fixed structure, or across a hinged enclosure, where a solid conductor would fatigue and break. The braid flexes instead, keeping the bond intact.

NEMA is the standard cited for this Blackburn braid, and it is manufactured in the United States. That combination matters on federal, institutional, and utility work where domestic-origin documentation is part of the submittal package.

It is sold individually, one braid per unit. If you are bonding several joints on a job, or standardizing a stock of them for maintenance, order the quantity you need as separate eaches rather than expecting a multipack.