Gibraltar GAB-2 2-Post Acc Mount Clamp The cast multi-clamp of this mounting platform guarantees secure and even mounting to cymbal stands and other fixed vertical tubes With four 3/8"-diameter knurled posts (two top posts and two bottom posts, all 8" long), this metal mount clamp holds 4 percussion accessories The cast multi-clamp of this mounting platform guarantees secure and even mounting to cymbal stands and other fixed vertical tub es With four 3/8"-diameter knurled posts (two top posts and two bottom posts, all 8" long), this metal mount clamp holds 4 percussion accessories