Designed for YU4, YU6, and other compatible speakers Heavy-duty steel construction with foam padding absorbs vibration to avoid damage to the floor and deliver clean audio output 7" and 4" wide top plates with mounting holes and 1/4" - 20 screw to fasten speakers of different sizes Rotating top plate lets you adjust the angle of the speaker to face any direction Hollow core perfectly conceals the wiring to maintain a mess-free look Spiked and domed rubber feet to stand firmly on both carpet and hardwood floorings