1-7/16 in diameter faucet punching, 4 in centers on 3 main holes, 5-1/8 in center to sink edge for 4th hole. 3-5/8 in diameter centered drain hole in basin. Made from single sheet of stainless steel with continuous weld stainless steel channels for a smooth, attractive surface. SilentShield sound-deadened bowls to reduce noise and vibration. Rolled outer rim and pre-assembled clips for easy installation. Includes installation hardware. Meets or exceeds IAPMO/UPC. Cut out: 24-1/4 in x 21-1/4 in with 1/2 in radius corners; 21 in x 15-1/4 in x 7 ft 'D basin.