C k wooden ruler 1 metre 36 inch folding ck tools t3510 professional quality construction with heavy duty brass hinges and end caps four fold design for compact storage blindman s indented markings on both sides side 1 metric graduations at 5mm on top edge and 1mm on bottom side 2 imperial graduations at 1 on top edge and 1 8 on bottomck tools t3510 folding wooden rule 1000mm 3