Kohler Hi devilbel this is Perrin with Kohler. This is sink is from Kohler's Stages collection. It is 1143mm by 470mm. Here is a link that includes PDFs of all dimensions, information and homeowners guides pertaining to the Stages collection.

http://www.us.kohler.com/us/Stages%E2%84%A2-45-x-18-1-2-x-9-13-16-under-mount-single-bowl-with-wet-surface-area-kitchen-sink/productDetail/Undermount-Sinks/427383.htm?brandId=651480&skuId=405416&categoryId=651473&hash=id%3Dfilters%26startIndex%3D20%26scrollTop%3D114