Feature a large diameter spindles for added strength and durability. Spindles and swivel nuts are made from cold drawn, carbon steel. * Acme thread for rapid operation and years of hard use. * Hardwood handles are over-sized for comfort, extra torque and reinforced with steel ferrules. The spiral pin used to secure the handles to the spindle is easy to remove for repair or replacement. * Metal parts are treated to resist rust. * The jaws, made from quality hard maple for a lifetime of use, are oiled to resist glue.