Drive-type screw fastener

Claim 1

A DRIVE-TYPE, COLORED THERMOPLASTIC POLYMER FASTENER WITH A TWIST-OFF HEAD COMPRISING A COLORED, THERMOPLASTIC POLYMER HEAD MEMBER OF REGULAR POLYGONAL SHAPE, A SHANK OF SAID POLYMER PROVIDED WITH A PLURALITY OF LONGITUDINALLY SPACED, TRANSVERSE SHOULDERS WITH NON-CIRCULAR, NON-RECTANGULAR PERIPHERIES, FLAT, UPPER FACES ON SAID SHOULDERS, SAID FACES HAVING RESPECTIVE PLANES AT RIGHT ANGLES TO THE AXIS OF SAID SHANK, THE RESPECTIVE SIDES OF EACH SHOULDER BEING INCLINED FROM THE RESPECTIVE UPPER FACE INWARDLY TOWARD SAID AXIS AND COLLECTIVELY FORMING A TAPERED, NON-CIRCULAR, NON-RECTANGULAR BODY, AND A BREAKABLE NECK OF SAID POLYMER CONNECTING SAID HEAD MEMBER AND THE UPPER END OF SAID SHANK, SAID HEAD MEMBER HAVING LARGER TRANSVERSE DIMENSIONS THAN THE TRANSVERSE DIMENSIONS OF SAID SHANK, SAID NECK HAVING A SMALLER TRANSVERSE CROSS-SECTIONAL AREA THAN THE RESPECTIVE TRANSVERSE CROSS-SECTIONAL AREAS OF SAID HEAD AND SAID SHANK TO MAKE SAID NECK WEAKER IN TORQUE STRENGTH THAN EITHER SAID SHANK OR SAID HEAD, WHEREBY SAID SHANK OF SAID FASTENER MAY BE DRIVEN INTO AND TIGHTLY SECURED IN AN OPENING COMPLEMENTARY IN SHAPE TO THE SHAPE OF SAID PERIPHERIES TO FASTEN SAID MEMBER TO ANOTHER MEMBER AND WHEREBY SAID HEAD MAY BE TWISTED RELATIVE TO SAID SHANK TO CAUSE SAID NECK TO SHEAR WHEN SAID FASTENER IS TO BE REMOVED, WHEREUPON SAID SHANK, WITH THE HEAD REMOVED THEREFROM, MAY BE DRIVEN THROUGH SAID COMPLEMENTARY OPENING.