Size: 4"x 3.6" x 2.5"tall 1.25" large center hole: for SPS, LPS colonies Standard 1/2" frag holes: for up to 6pc 1.5" frag plugs 2.5" height, prefect for aquarium with sand bed or bare bottom 100% cast acrylic, safe for your aquarium Reefing Art Coral Frag Rack Colony Holder Bottom Sand Bed Frag Plug Holder