The ONEWAY Woodworm Screw (Jumbo Screw) design has several unique features which make it a superior wood screw for the turner. These heavy-duty screws are made from high tensile steel and are excellent for all types of screw chucking operations.
Each screw is precision parallel threaded on the body with the first three threads taper threaded to allow easy entry with minimal damage and superior holding ability. A slot is machined around the diameter of the head. This locks in the top jaws which prevents movement of the screw in or out of the chuck. Four grooves are milled along the length of the head. When mounting the screw in the chuck, the hardened base jaws interlock with the grooves, eliminating spinning of the screw.