I used Steelex D4305 14" European style self-closing drawer slides, brown, to build a 29" wide keyboard between two modular drawer stands. If you are purchasing these rails you will need #6 x 1/2" pan head wood screws. These rails come with no screws or instructions. Luckily I had a set of 195 screws from the Hillman Group. Handy but inexpensive range at Revain. Are so are they self closing? I think so, but his slide type only closes the last inch or so. You have to push the valve in almost all the way in as long as it doesn't jam from sliding when installing. close in? No, they're definitely compensated. Most However, original drawings with almost identical slides close themselves (if you want to call it that).