Klein Tools 53721 Flex Bit Kit

Three pieces: the flexible drill bit (Cat. No. 53718), a wire mesh pulling grip, and the folding wire placement tool (Cat. No. 53715SEN). That combination lets you drill through a stud or top plate, grab the cable with the mesh grip, and place or retrieve it in the cavity without opening more wall than you have to.

The wire mesh pulling grip is rated for 1/2-inch to 9/16-inch outside diameter wire and cable, and the kit overall is for work on wire up to 9/16-inch (14 mm) O.D. Anything larger than 9/16-inch O.D. needs a bigger grip.

No. Klein's warnings on the 53721 kit state never to use it on or near live electrical circuits. De-energize the circuit first, wear approved eye protection, and inspect the pulling grip before each use.

The screw point drill tip is made to help pull wire through the material as you drill, and the mesh grip is what attaches the cable to the bit for the pull back. So the workflow is one pass: drill through, hook the cable in the grip, and draw it back through the hole you just made.

The drill bit is spring steel, which Klein specifies for extreme flexibility, so it will flex inside a wall cavity to reach an angle a rigid auger bit cannot. The kit's material spec also lists high speed steel for the cutting end.

Yes, and it is printed on the grip itself. Klein's instruction is not to exceed the maximum safe load listed on the label attached to the pulling grip, and to match the proper size and type of grip to the application. Read the label before you put a winch or a hard pull on it.

Retrofit wiring in finished walls and ceilings. The 5-foot flexible bit drills through studs and plates from one cut-in opening, the folding placement tool reaches and steers the bit or the cable inside the cavity, and the mesh grip pulls 1/2-inch to 9/16-inch O.D. cable back through. It is the three-tool set for running new circuits without gutting drywall.

The bit goes directly into a drill. Klein's note with the 53721 is to read and follow the safety instructions in your power tool owner's manual, which is the governing document for chuck and speed use. The placement tool in the kit is hand-operated and folds up for storage.

They are separate Klein catalog numbers: the flexible drill bit is Cat. No. 53718 and the placement tool is Cat. No. 53715SEN. The 53721 is the three-piece set that bundles both with the wire mesh pulling grip, so ordering the kit is how you get all three under one part number.