... block, wallboard and other hollow base material The toggle bolt is a spring wing type hollow wall anchor designed for ... block, wallboard and other hollow base materials. The toggle bolt is a two-part assembly consisting of a machine screw ... 2" length to 1/2" diameter x 6" length with combo round, flat mushroom, tie-wire or slotted hex head ... , or M107/85501/2, or M121-1/4680 Toggle Bolt with spring wing