Heavy Duty Butterfly Anchor with Zinc Plated Screws High Load Hollow Wall Toggle Fastener for Solid Hollow Block Wall Product Description The Heavy Duty Butterfly Anchor with Zinc-Plated Screws is engineered for high-load hollow wall applications demanding maximum holding strength. The anchor features oversized zinc-plated steel toggle wings with a reinforced hinge mechanism that provides consistent deployment reliability under heavy load conditions. Each anchor is factory