Tap hole diameter: 35 mm. Number of clips: 4. Clip type: Undermount clip. Bowl rounding radius: 75 mm. Transfer: yes, standard. Drain position: on the wall. Drain diameter: 3.5". Chamber thickness (mm): 0.6 mm. Installation into the base: 450 mm. Cutout in the countertop: 345.3 x 405.5 mm. External dimensions (length x width): 420 x 360 mm. Number of bowls: 1. Dimensions of the bowl (length x width x height): 400 x 340 x 180 mm., Manufacturer: Smeg