For some time I’ve been wanting to organize my clamps and replace the triangular tool rack that I built a long time ago (see last photo). I had some wall space so I came up with this simple design. They are nothing more than 4 strips of plywood glued back to back, except, the last piece was cut at 45 degrees lengthwise and only 1/2 of it is glued to the main board. The other half is screwed into the studs of the wall and the main board hangs on it as a french cleat. French cleats are incredibly strong and they have the advantage of having the hanging item being removable. All slits are ~1.625” deep, but, the first rack has 3/8” slits spaced every two inches (1st picture) and the second rack has 1/4” slits spaced every inch (2nd & 3rd & 4th picture). The two sizes allow for varying clamp sizes. Clamps sit securely in the slits without having to operate the clamp as a grip. The height to which they were mounted was dictated by the maximum length of clamps that I own. The smaller clamp rack was mounted under my hand planes cabinet but still has sufficient height for the smaller clamps. All slits were cut with a table saw sled using successive cuts with a standard blade. A dado would have made the job easier.