made by the injection molding of a plastic material such as polycarbonate sold by ge plastics pittsfield mass usa under the trade name lexan the attachment of the endpiece 24 to the blade may be accomplished by for example radio frequency induction heating ultrasonic welding or integral rivets as shown in fig2 the upper and lower surfaces of the endpiece contain two indentations 242a and 242b respectively in the preferred embodiment shown in fig2 the indentations are grooves that run transverse to the cutting edge 222 of the blade the rear of the endpiece 24 contains a horizontally projecting lower member 246 and a downwardly pointing hook 244 the area where the horizontally projecting lower member 246 joins the endpiece 24 defines a recessed area 248 the hook 244 of the endpiece is complementary to the hook 148 of the handle assembly guide referring still to fig2 the protective blade cover 30 is a hollow structure defined by two sets of parallel walls and an end wall 38 shown in fig1 connecting the parallel walls the two sets of parallel walls consist of a set of side walls 32a and 32b and a top wall 34 and bottom wall 36 shown in fig1 the walls are dimensioned to fit over the blade assembly 20 securely and to cover completely the cutting edge 222 of the blade when the blade assembly 20 is inserted into the protective blade cover 30 at the same time the walls are dimensioned to leave exposed the hook 244 and the horizontally projecting member 246 when.