The Toggle Bolt is a spring wing type hollow wall anchor designed for use in block, wallboard and other hollow base materials. The Toggle Bolt is a two-part assembly consisting of a machine screw and a spring wing toggle. Sizes range from 1/8" x 2" to 1/2" x 6" with combo round, flat, mushroom, tie-wire or slotted hex head styles.Stanley Black and Decker (Powers Fastener)