British System / Metric System Triangular Rule 90° Wide Bottom Thicken Aluminium Alloy Carpenter's Square 45° Angle Square

Features:
Thicken aluminium alloy/ aluminum, high hardness, corrosion resistance.
Bright painting, anti-aging, durable and wear-resistant.
Graven figure on surface, clear and feels real, wear-resistant.
Hollow out graphics make it easy to measure corners.
Conversion formula graved on surface, simple to transform, practical and delicate.
British system and metric system, 7in and 12in, different figure standard and size are optional.