Kraus GV-710 Lava Glass Vessel Bathroom Sink 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 Tempered Glass Construction Designed for Easy Above-Counter Installation Scratch & Stain-Resistant Easy-to-Clean Polished Surface Standard 1.75" Drain Opening Works w/ Pop-Up Drains w/o Overflow