Spear & Jackson CTS12 12 Inch Carpenters Try Square The Spear & Jackson CTS12 is the perfect hand tool for checking and marking right angles in constructional work. It is rosewood stained with a brass top and bottom face for increased durability. Features: Perfect for marking right angles Rosewood stained hardwood with brass top and bottom faces Spring steel blade Specification: Base Length: 203 ± 1mm Base Depth & Width: 48 x 18.0 ± 0.5mm Brass Edge Thickness: 3mm