4 Pack Hold Down Clamp Kit, Cnc Router Clamp For Woodworking And Metalworking, Feature: This clamp can be used on a T-Slot Aluminum Spoilboard, and also can be used on Threaded MDF Spoilboard with pre-installed threaded holes (4mm (0.16'')) . Compatible with Genmitsu PROVerXL 4030 CNC router kit, 3040 Extension Spoilboard, as well as other large CNC machines. Just make sure the size of T-Slots/ holes on your Spoilboard can be compatible with this clamp. Dimensions: This clamp is 85mm length x 20mm width x 68mm height. (3.35'' x 0.79'' x 2.68''). Working range: This clamp accommodates material up to 35mm (1.38'') thick and holds it firmly in position. It can hold a variety of materials for desktop CNC router machines. Sturdy Quality: Constructed of High Strength Cold Rolled Sheet for durability and wear resistance. Versatility: This clamp provides exceptional clamping forces for your universal t-track system configurations and assemblies. It is ideal for work holding, positioning, and fixturing for woodworking or metalworking, including routers, drill presses, CNC, table saws, jigs, panels, vertical mills, and more.