Allen Heath AH-QU-SB-RK19 19 Inch Rack Mounting Kit for Qu-SB Digital Mixer QU-SB-RK19 Rack Mounting Kit for Qu-SB digital mixer (4 RU) in a standard 19" rack. Each of the two steel rack or flight case attaches to the sides of the mixer with the included screws. Features: For Qu-SB Digital Mixer Fits in Standard 19" Rack / 4 RU Echotone Music LLC is an experienced E-commerce Audio Visual Equipment dealer since 1998. We take pride in selling Pro Audio gear for musicians, sound engineers, production companies and broadcast applications. Shipping --Pro packed shipped USPS, UPS or Freight Service. Contact us pay for 2 day air upgrade on any unit. We are working hard to get your product ( built if needed), processed shipped. Processing times vary, 2-30 days Returns/Refunds- If there is truly a manufacturing defect a return tag will be provided. Otherwise customer pays for return shipping. Returned items must be sealed/unopened to qualify for a full refund. Refunds are for the Item cost only. Gear returned with out all its original packaging, accessories or shows signs of wear, is subject to an additional service fee. This item is now used and it would be unfair to resell to another customer as new. What products can not be returned? - Clearance items, Custom Builds, items identified as non-returnable, discontinued items, used or NOS items, electronic software downloads, demo gear, computers, vacuum tubes, earbuds, harmonicas raw-frame speakers, drumheads, drumsticks, turntable cartridges, fog fluids