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http://www.medpacking.com/electrical-capping-machine-for-screw-cap-p-1356.html
Electrical Capping Machine for screw cap
Hand-held electric Capping Machine easy to carry, can be easily used to tighten loose, or spin a variety of caps. The adjustable clutch can effectively avoid the cap damage and reduce the wear and tear inside the plug. Once the cap is fully tightened, the machine automatically stop rotating head that you can cap the next operation.