All-in-One Set for square guide rail clamps, including locking screws and guide blocks; a versatile, essential addition to any workshop. Durable construction: built from sturdy aluminum alloy and stainless steel to withstand regular use. 90-degree precision every time: CNC-machined aluminum stop delivers accurate 90-degree alignment for both complex designs and simple tasks. Key benefits: improves accuracy and repeatability, reduces setup time by keeping critical clamping tools in one package. Compatibility and materials: designed for standard square guide rails and guide blocks; made with aluminum alloy and stainless steel for long life. Use scenarios: - Align and clamp workpieces for CNC routing, milling, or drilling to ensure square results. - Create precise 90-degree joints when building cabinets, frames, or metal fixtures. - Set up jigs and fixtures for repetitive drilling, sanding, or assembly tasks.