Features For use in light-duty applications, these steel toggle bolts offer easy installation. The spring-type wing expands to secure the bolt from an otherwise inaccessible point. Use on block, drywall, hollow walls, ceiling, and steel construction. Toggle Bolt Type / Toggle Bolt Anchor Anchor Material / Steel Fastener Finish / Zinc Plated Anchor Thread Size / #10-24 Usable Length / 2 5/8 in Screw Length / 4 in Size / 3/16 in Head Type / Mushroom Bolt Size / 3/16 in Thread Length / 3 7/8 in Drill Size / 9/16 in Head Dia. / 3/8 in Head Height / 1/8 in Wing Span / 2 in