K&M 18807, Universal Holder, Attaches to the K&M 18950 or 18953 keyboard/stage piano stands, as well as to table-style Omega 18810 and 18820 keyboard stands, Infinitely swivelable and extendable, Infinitely adjustable in height and distance, Extendable from 240 to 400 mm, Various accessories are available, including boom arm, gooseneck, iPad holder, tablet PC holder, etc., all of which can be attached to the included threaded adapter (accessories are not included, must be ordered separately), Material: Steel, Length: 268 - 418 mm, Weight: 0.74 kg, Includes a threaded adapter: 3/8"" to 5/8""