This adjustable positioning clamp is made of lightweight high-quality plastic and works as a circular saw guide rail for precision wood cutting. It is specially designed for 4-inch cutting machines and also compatible with select 5-6 inch models, locking bases from 145mm to 208mm (5.7 to 8.2 inches). The side distance is easily adjustable, and the bidirectional reverse buckle ensures stable use. Ideal for DIY enthusiasts and professionals needing a reliable saw guide or rip fence for circular saw.