Toggle Bolt Hollow Wall Anchor 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" diameter x 2" length to 1/2" diameter x 6" length with combo round, flat mushroom, tie-wire or slotted hex head styles. FEATURES AND BENEFITS + Adjustable to accommodate various wall thickness up to 2 1/2" + Easy to use and works in a variety of base materials