Superior quality aluminum alloy is used to ensure a light weight but super high strength support. Advanced CNC (Computerized Numeric Control) machine systems provide precise dimension to fit perfectly. Aluminum Anodized surface treatment assures years of corrosion and abrasion resistant operaton. Anti twist locking screws match the international standards Special anti slip rubber pads enhance the grip between each plate and the mounted gear, and protect the gear from any damage due to mounting.