These fiberglass Log Rules are specially designed for use in Ontario. They have graduations in 1” classes, with the break at ¾”. They also includes defect deductions, for 20, 25, 33, and 66% in 1” values.
The Ontario Metric Cube Log Rule has graduation in 2cm diameter classes. Available in two sizes, 54 cm (MC-1) and 78 cm (MC-2). Other provincial log rules are available on a special order basis.