* Features: 1.Manual adjustable,precise controlling. 2.Suittable for plastic and glass lenses.3.Adjustable groove position(front-central-rear). 4.Accurate on all profiles. Specifications: 1. Adjustable groove depth:from 0 to 0.7mm 2. Groove width:0.65mm 3. Lens thickness:from 1.5 to 11mm 4. Lens diameter:from 18 to 70mm 5. Power:90w