Gibraltar SC-4425D-1 Tom/Perc. Arm, 7/8" diameter post with an 9.5mm ratchet L-Rod for mounting cowbells, blocks, tambourines and other accessories, L-Rod also fits some tom mounts and electronic drum pads
Used two of these to mount an 18" floor tom (ala Neil Peart) to my rack, in the floor leg mounts. Worked a treat, super stable and doesn't budge. Only issue is that it didn't come with a memory lock, but other than that, great!!