American Standard 9960.403.020 Mezzo Semi-Countertop Sink with 4-Inch Faucet Spacing and Rear Overflow for 13-Inch Minimum Depth Countertop Sinks, White Self-rimming, drop in counter sink Fireclay construction 4-Inch center faucet holes Requires a 13-Inch minimum depth countertop for proper installation Rear overflow