These sockets work where deep sockets just aren’t deep enough. Kobalt’s Thru-Ratchet sockets and ratchets are hollow down the center, so they can fit over any length of bolt. In a lot of cases you could get the same performance out of your ratcheting wrenches, but this system allows you to get into deep recesses that would otherwise be inaccessible.
Thru-Ratchet sockets plug right in to the ratchet handle, instead of attaching to a square drive. Integrating into the handle reduces overall height by up to fifty percent over a standard ratchet and socket — which is good for areas with low clearance.
The Thru-Ratchet comes in a 22-piece metric and SAE combination set. The set includes a 1/4″ and 3/8″ socket adapter, a 3″ extension, and sockets in SAE sizes 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, and 3/4″, and metric sizes 10, 11, 12, 13, 14, 15, 16, 17, 18, and 19mm. You can also get the Thru-Ratchet in a two-ratchet, 46-piece set, but after extensive research, I couldn’t find any specs. Lowes.com and Kobalt.com provide little to no info — shame on them.
I’m going to make an educated guess that KD Tools manufactures the tools for Kobalt (Lowe’s house brand) — KD has offered a pass-thru system since 2003, and the sets seem to be identical except for the design of the ratchet handle. Kobalt’s versions will definitely be easier to get your hands on, since you can pick ’em up at any Lowe’s.
Prices are $40 for the 22-piece and $60 for the 46-piece set. If you have any info on the 46-piece set, let us know in comments.