The Milescraft TrackSawGuide turns any circular saw into a precision guided track saw system. Achieve perfectly straight cuts whether you are ripping sheets up to 50in. long. cross cutting. or angle cutting. Eliminate risky freehand cutting that wind up costing you valuable time. money and frustration.The aluminum base is lined with anti-friction pads that glide along the rails for smooth and easy operation. Additionally. you can dial in your preferred tension using the included Glide Adjusters. The base of the TrackSawGuide is universal. fitting most circular saws in the market with blades up to 7-1/4in. Long anti-slip strips on the bottom of the rails keeps the TrackSawGuide in place. The TrackSawGuide can extend from 27.5 to as long as needed with available GuideRail additions.Fits most circular saws in the market with blades up to 7-1/4(Not compatible with most worm drive or rear handle saws. See compatibility chart for size guide.)Cuts 50 out of the box. or extends to any length required with optional GuideRail extensionsIncreased rigidity reduces the flex for a more accurate cutThe red cutting-strip acts as a guide and the blade will cut directly up to the edgeThe cut strip prevents chipping and splintering and reduces slipping on work pieceThe low profile also lets you cut deep enough to cut through common interior door thickness