The Bosch TG502 is the new tuckpointing guard for all AG and GWS 4 1/2 In. /5 In. /6 In. series grinders (excluding GWS8-45, GWS9-45, and GWS18 V-45). Its tool free installation makes it quick and easy to install and remove. The variable depth adjustment allows the guard to collect dust throughout the duration of the cut, from the initial plunge until the blade is removed from the material. The large viewing window makes it easy to see the line of cut when in operation. The dust extraction port ensures a cleaner work piece and job site when used with a vacuum.