Hinge Specifications: The stainless steel piano hinge set includes 4 stainless steel hinges and 48 screws. The hinge size is 30 × 3 cm. Mounting hole size: 4 mm. The hinge comes with 12 pre-drilled holes. High-quality Material: Made of durable 304 stainless steel with a polished finish, these hinges resist rust and prevent misalignment. The quality ensures long-term use. that you can trust. Easy Installation: Pre-drilled holes allow for quick and easy installation. With 12 pre-drilled holes and 48 screws, the hinges are easy to assemble. Wide Application: These extended hinges are used in various applications, including pianos, furniture repair, cabinets, doors, windows, garden maintenance, and more. They are also suitable for hinged lids, hatches, and modern boats/yachts/RVs.