The K&M 18956 Boom Arm attaches to K&M 18950 or 18953 keyboard/digital piano stands The K&M 18956 is a two-piece telescopic boom arm complete with locking washer and plastic grip. Fully adjustable in height and tilt, it features smooth, silent, scratch-free adjustment thanks to a large wing nut. To attach to the K&M Omega 18810 table stand, the K&M 19856 boom arm requires the K&M 118814 adapter.