Metallics MFB1254 Fish-Bit Flex 1/2 x 54 Shank 3/16" (1pc)

The MFB1254 flex fish bit cuts a 1/2 inch hole and the bit measures 54 inches overall, so it reaches through multiple studs or plates in a single pass without pulling the bit and re-setting it.

A flexible fish bit like the MFB1254 is for drilling and fishing cable inside a finished wall. You feed the 54 inch flexible shaft in through a cut-in box or a small access hole, bore the 1/2 inch pass-through in the stud or top plate, then use the hole in the bit tip to pull the wire back through. That is what separates it from a rigid auger, which needs open framing and a straight shot.

A 1/2 inch bore is the common size for pulling residential branch circuit cable through studs and plates; it clears typical NM cable and small low-voltage bundles. If you are pulling several cables or larger conductors through one hole, step up to a bigger diameter flex bit rather than forcing the pull through a 1/2 inch hole.

It ships as one piece, packaged in a pouch. There is no extension rod, flex shaft guide, or additional diameter included, so order those separately if your run needs them.

Metallics MFB1254. That is the manufacturer part number as well as the model designation: 1/2 inch cutting diameter, 54 inch length, 3/16 inch shank, sold one per pouch.