LOXX Snap fastener Upper part Heavy Duty. For a complete fastener this item also requires: Loxx key (SKU: 96-9590) and any Loxx lower part (SKU: 96-9620N, 96-9450-N) and a 3/8" Punch. Fast closing, securely closed. Surface: Nickel on Brass. Contents: 1 upper part big head with standard washer (clamping range up to 3 mm). Simple installation. Made in Germany. The LOXX Heavy Duty upper part is the best of its kind. Externally, we have reinvented our new LOXX Heavy Duty shell inside. With an ingenious improvement, you have an ultimate upper part that guarantees even greater durability and better operation. The Strongest, Most Versatile, Self-Locking, Quick Release Fasteners Ever Made! Will never accidentally open. Will never rust. Precision Engineered. Withstands shearing force greater than 1,000 N.