UCHIDA KO-TYPE PATENT UCHIDA KD-type drafting instrument beam compass DW-500. Capable of drawing large circles up to a maximum radius of 960mm. A precision tool set made of aluminum, including two 500mm beams. Includes a 2mm pencil lead, a ruling pen tip, and attachments for drafting pens. ⭐ I received this from an architect acquaintance. It appears to be unused. Please note that the outer box and instruction manual are not included.