Brake line wrenches (flare nut wrenches or simply line wrenches) serve a specific purpose. Domestic cars often use 7/16-inch and imports 10 mm.

Snap-on’s flare nut crowfoot wrench set includes sizes 12, 13, 14, 17 and 19 millimeters and features thin wall design, 12-point flare configuration and flank drive wrenching system.

With a flare nut wrench, there is just enough of a cut-out at the end to slip the line through, thus allowing for a better grip on the working surface. We like the six-piece set from Grip ...

The flare nut wrench set I had was a Duralast set from AutoZone, which currently sells for about $22. These can be had for far cheaper on sites like Amazon.

These are by far the best flare nut wrenches on the market—something you'll want to invest in. The heads allow for more surface grip, and you just slide it on over the line up to to the nut.

Normally, a handy flare nut wrench will make short work of lines like these, especially if you have the kind of room that I have on my school bus.

Mechanics or anyone who uses a wrench on a regular basis may be interested in a new patented design of the Tribus Enterprises 360 degree ratcheting flare nut wrench. Watch the video below to learn ...