corkscrew with a fitting to shear tinfoil , plastic or other caps on the upper part of the neck of bottles possibly including a collar , the corkscrew comprising an at least partly flat grip having a possible zone to contain a drawing screw , an element to anchor the drawing screw and a short supporting element , cutting fitting being included and consisting of small shearing wheel cooperating with recess , which are substantially coherent with the outer diameter of the neck of the bottle and are associated with positioning and guide members cooperating with the upper part of the neck of the bottle .