Wooden Rule Metric/Imperial T3510Innovate Electrical Supplies Ltd » Products » Brands » CK Tools » Wooden Rule Metric/Imperial T3510 Part No: T35101m (3ft) Wooden Rule. Metric/Imperial.Professional quality, four fold with heavy brass hinge and tips."Blindman's" markings on both sides. Graduation - 5mm top edge, 1mm lower edge on one side; on reverse. 1/8". Quantity Product in stockPrice: £15.16 Inc VAT: £18.19 Updating cart... Updating...