Cross-section of exclusive Double-Decker design
The patented Double-Decker design improves strength and cutting performance while reducing top deck rust. Two welded decks include a 3-mm (11-gauge, 0.118-in.) to 3.5-mm (10-gauge, 0.138-in.) thick upper deck, depending on the model, and a 3-mm (11-gauge, 0.118-in.) to 4.5-mm (7-gauge, 0.177-in.) thick lower deck, depending on the model.
Internal stiffeners are sandwiched between the decks to add extra strength and rigidity.
The Double-Decker design also provides a sturdy base to support the gearcases. Gearcases need this sturdy base to resist the bending loads imposed upon them when blades contact immovable objects or the ground.
The bottom deck is the main defense against rocks and field debris, to help protect the top deck from impacts so it will retain its smooth form.