We feel our NT-4000 Premium Neck Turning Tool is the finest, easiest to adjust, most accurate and comfortable to use hand neck turning tool available. Our Premium Tool employs an eccentric mechanism (not an eccentric mandrel) for quick cut depth adjustments which are accurate to .0001 inch with our carbide mandrels. The click adjustable cutter adjustment knob moves the cutter in either direction in .0002 inch to .00025 inch per click increments. Depth of cut can be adjusted a total of .004-.005 inch using the laser engraved adjustment knob. The Premium Tool comes with three laser marked feeler gages which are used to quickly set the cutter depth to the approximate range of the cut desired Mfg: Sinclair International