An adjustable, foldable support leg for a bass drum has a cylindrical leg member movable longitudinally within a tubular leg member. A threaded portion of the tubular member includes apertures in which ball bearings are located. The bearings are retained in the apertures by an annular locking collar which is also threaded to allow the collar to move longitudinally on the tubular member as the collar is turned. The locking collar has an interior frustoconical surface. When the collar moves downwardly on the tubular member, this surface presses the ball bearings against the cylindrical member, locking the leg members in place. A mounting bracket includes a pin about which the folding leg pivots and a channel which receives the inner end of the leg. The leg is biased against the floor of the channel which includes detents to receive the end of the leg in the folded and extended positions.