3CM ONE Quartz. Support not required. Overhangs under 12". Use full sub tops greater than 6". Overhangs under 16". Full sub top with rbels. 12" – 18" use full sub top along with rbels evenly spaced at 3' on center or less. 16" – 24" use full sub top along with rbels evenly spaced at 3" on center or less.