Aluminum Ruler Mathematic Geometry Set, 4 pieces of Drawing Accessories for design, graphic, examination, math or painting Aluminum Ruler Geometry Set of 4 for Mathematic, Drawing, Design, Studies / Examination etc. 1 Ruler 15 cm 1 Protractor 180' / 9 cm 1 Square 30' degrees - 6cm x 10cm 1 Square 45' degrees - 7cm x 7cm