Features: 1.Precision 2 In 1 System: Combines an invisible fastening mechanism with a precision slot base to create perfectly aligned grooves and hidden joints, ideal for seamless mortise and box joinery in fine woodworking projects. 2.Universal Compatibility: Designed for broad compatibility with most handheld edge trimmers and engraving routers, featuring an adjustable slot guide rail with bushing system for accurate positioning across various tasks like panel attachment and edge banding. 3.Transparent Design For Accuracy: Equipped with a clear cover that provides excellent visibility of the cutting tool during operation, ensuring precise groove cutting and veneer trimming for high-quality results. 4.Durable And Stable Construction: Made from lightweight yet robust aluminum and bakelite composite materials, offering durability and stability during machining while maintaining ease of use in tight spaces. 5.Multi Functional Woodworking Aid: Serves as a versatile router guide rail accessory, transforming your router into a powerful tool for effortlessly creating dado joints, box joints, and other complex wood joinery structures. Specification: Material: Aluminum Alloy, Engineering Plastic Applicable Board Thickness: Approx. 0-5cm/0-2in Screw Hole Size: Approx. 62 x 70mm/24.4-27.6in Application: Inside Diameter 65mm Trimming Machine Package List (optional) Package 1: 1 x Slotted Plate Package 2: 1 x Slotted Plate + 1 x Transparent Cover Package 3: 1 x Slotted Plate + 1 x Transparent Cover + 1 x Transparent Bottom Knife Package 4: 1 x Slotted Plate + 1 x Transparent Cover + 1 x Transparent Bottom Knife + 1 x Locator