Aquamaxx Frag Racks Rectangle Shape The perfect frag rack for coral propagation! The high quality JNS Frag Rack is made of cell-cast acrylic and powerful magnets. Fits most frag plugs with stems up to 3/8 (10mm).FeaturesPowerful magnets for aquariums up to 1/2Dimensions: 11.5 x 4Holds 23 plugsHigh quality acrylic construction