Previously, changing from using a microphone to a laptop rest with my Baby Spider Pro was an arduous task, involving unscrewing and replacing the entire top plate of the stand. With this simple little accessory pack, I can easily choose one or both, simply by changing a single screw-in adaptor. I only wish I'd bought it sooner!
Note: to use a microphone and a laptop together, you'll also need the K&M 18872 mic stand extension rod, to raise the boom arm over the laptop screen.