thanks for replying. its the threaded part of the tap that connects to the water pipe that comes up about an inch short on standard taps due to the wooden worktop.do you mean the depth of the thread on the tap going through the worktop or the length the tap will reach into the sink? If it the latter then i was in the same boat and just had to give up in the end and settle, you could always go to a specialist kitchen shop and look at what they have on display if there are any open in your area