Fury Professional Double Lock Leg Iron Oversized w/Key. The Fury Iron Leg Cuffs have carbon steel construction are serial numbered and designed for professionals. Each pair comes with 2 keys. Specifications for Fury Professional Double Lock Leg Iron Oversized: Manufacturer: Fury Quantity: 1 Package Contents: Fury Professional Double Lock Leg Iron Oversized Fury FP15904: Professional Double Lock Leg Iron Oversized w/Key