I have 2 here, one is really worn and the other like new still. Can't get either of them any closer than 1/2 inch from the roller due to the slot it sits in. The new one is 1 inch from the cutting edge to the slot, 2 inches high with the cutting edge angled to about 20 degrees, this stops the leather riding up the blade. Slot is 1/2 inch high by 1 inch long.