Features: brand new and high quality. DESIGN: The size of the slot block of the clamp is designed for 3018 series CNC router. It can also fit ALL other 3018 series desktop CNC router perfectly. DIMENSIONS: This clamp is about 50x20x56mm/1.97x0.79x2.20 inches in length width and height. FEATURE: The clamp accommodates material up to 30mm and holds it firmly in position. It can hold most of the material for desktop CNC router machines. MATERIAL: The hold down clamp kit is constructed of zinc-aluminum alloy for durability and wear resistance. VERSATILITY: This clamp provides exceptional clamping action for your universal t-track system configurations and assemblies. It is for ideal for work holding, positioning, and fixturing for woodworking or metalworking, including routers, drill presses, CNC, table saws, jigs, panels, vertical mills, and more. Specifications: Material: Zinc Aluminum Alloy Assembled Size: approx 50x20x56mm/1.97x0.79x2.20 inches Package Includes: 1x M6 Engraving Machine Hold Down Clamps note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.