The Rotring Triangular Reduction Scales is a professional tool made of high-quality durable materials, perfect for planning drawings, scales and measurements. Suitable for professional use or students. Triangular Reduction Scales High-polished surface Precision divisions numerated both ways Dimension markings in cm and m for easier working Two coloured flutings for easy recognition of scale Reduction Scales 1 : 20 1 : 25 1 : 50 1 : 75 1 : 100 1 : 125