Tempered glass construction Designed for easy above-counter installation Scratch & stain-resistant Easy-to-clean Polished surface Standard 1.75 inch drain opening works with pop-up drains without overflow Sink is constructed from solid tempered glass Sink features polished glass interior and exterior Designed for above counter installation with standard us plumbing connections Limited lifetime warranty Certified and listed by upc cupc csa iapmo ansi and scc