Since dovetailing is a ripping operation, where the saw kerf is running with the grain, the Lie-Nielsen progressive pitch dovetail saw has its teeth filed to a rip profile with the teeth starting small at the front and getting larger towards the rear of the blade. In practical terms, this makes the cutting of the joint faster with great precision.Each tooth is slightly less than 0.025mm(0.001") larger than the next. Giving from 15tpi to 9tpi from the tip to the handle. Hand set and filed. Length, including handle, is 375mm(15"), with an overall height of 108mm(4"). Useable blade dimensions are 250mm(10") long by 41mm(1.5/8") deep 0.05mm(0.020") thick.