Stage and Studio Equipment Case Auto locks The Stand Into Four Height Settings. The Hercules KS210B is a Double X Keyboard stand with a second tier. This stand features the patented EZ-LOK system, four height adjustments, and heavy duty steel construction. EZ-LOK system automatically locks the stand into one of four height settings. Height of 2nd tier is adjustable from 198-300mm(7.8′-11.8′). Protruding teeth on adjustable rubber foot provides stability on uneven floors. Set up and tear down easily with the compact stand design. We work hard with all of our customers to ensure that they are getting an excellent shopping experience. Communication is KEY to helping us give you the ...