BSH (Bosch, Siemens, Gaggenau, Neff etc.) sells this under several different part numbers - they're all the exactly the same. So if you're after the WTZ11400, 3AS220B, or 00574010 stacking kits, this will fit the bill and may be cheaper. That said, there are several BSH stacking kits, depending on the model/serie you're dealing with, so check the documentation carefully before committing. To install, you *WILL* need to drill into the top of your washer with the supplied depth-limited drill bit (drill not included), and you'll need two people to lift the dryer onto the washer. Once secured to the top of the washer, and the end stops are screwed in, the dryer is securely held in place. The slide out drawer is handy for resting a basket on when loading and unloading the dryer. Photo shown, the stacking kit is sandwiched between the washer (lower) and dryer (upper), with shelf slid out (it slides back in to be flush with both).