The Spider Pro is equipped a pair of extendable support arms, as well as an additional pair of extendable support arms with a 15? tilt angle. It can be fitted with additional support arms for a third keyboard. The Spider Pro also has a 3/8" or 5/8" threaded connection for attaching microphone booms. The tilt of the Spider Pro is greater than that of the Spider to allow easier playing when two keyboards are being used. On top of this, it also provides optimum leg movement thanks to the raised design of its feet, continuously variable height adjustment and a special mechanism for collapsing the stand. Maximum load capacity per tier: 77.16 lbs, Wt: 21.39 lbs H: 51.57", Depth: 11.81"/18.7"