The Sinclair NT-1500 Neck Turning Tool's ergonomic exterior is a slightly scaled down version of the premium model and features fine (80 threads per inch) adjustment on the cutter depth screw. The adjustment screw is engraved with hash-marks for easy fine-tune adjustment. Each mark on the adjustment screw corresponds to an approximate 0.001" change in cutting depth (0.00104" to be exact), making it extremely easy to adjust well within 0.0005" of a specific neck wall diameter. Fine cutting depth adjustment (0.001" Adjustments) High speed tool steel cutter Hard coat anodized finish The NT-1500 comes either by itself, or with the Sinclair Mfg: Sinclair International