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Underside: Bottom of bowl undercoated to prevent condensation and deaden sound. Self-rimming: Sink is furnished with appropriate number of clamps to provide a watertight installation. OTHER Drain opening: 3-1/2". Faucet holes: Available with 3 faucet holes only, 4" center to center. Note: Sinks only available in multipacks of 18. Model DPR1812522 SINK DIMENSIONS (INCHES)* Model Number Overall Inside Each Bowl Cutout in Countertop (11/2" Radius Corners) Number of 11/2" Dia. Faucet Holes