tslot Letter-shaped aperture Opening for a letter-shaped bolt Router table groove Mounting fixture for shop machine parts Mounting feature for shop machine parts Letter-shaped workbench groove Kind of notch Groove in a milling machine Letter-shaped opening for a bolt Groove for a letter-shaped bolt A weather strip may fit into it Letter-shaped opening in some pistons Letter-shaped opening in a machine shop Type of milling cutter Certain opening Letter-shaped track in metalworking