If you've got a Bosch circular saw and want super straight, clean cuts, this guide rail adapter is a game-changer! It lets you attach your handheld circular saw to compatible Bosch guide rails (like the FSN 70/140 models) for perfect parallel cutting every time. Works with a bunch of Bosch saws: GKS 190, PKS 40, 46, 54, 66, GKS 36 V-LI, GKS 55, 65, 85, and more (check your model). The adapter itself is blue, measures about 280x190x15 mm, and gives you a max cutting depth of 50 mm in wood. Made in Germany with Bosch's typical precision. This accessory turns your saw into a more accurate tool for trim work, shelving, or any project where a straight edge is crucial. Comes as one adapter. A must-have for serious DIYers, carpenters, or woodworkers who already use the Bosch rail system. Makes pro-level results way easier to achieve. Quality Bosch engineering in a simple, effective add-on.