Lens Drilling Machines Specification Double-side drilling system,running without cracks Vacuum absorbing system,protecting the camber effctively, The upper and lower taper drill bits (| 2mm)operate simultaneously there by avoiding chipping and other lens damage. The reamer enlarges hole sizes from | 1.5 mm to 2.5 mm Power source:110V/60Hz 220V/50Hz Power: 60W Weight: 4Kg Size: 150*120*300mm