This rule is made of hardened & tempered stainless steel material and incorporates a scale from 0 to 120 degrees in increments of 1/2 degree two centre dots are provided, one on each blade and with the aid of dividers, the ruler can be set at any angle, or an existing angle can be determined with the line of chords.
The circumference scale indicates the circumference by measuring the diameter, it also has sub divided mm and line of chord scale on one side. On the other side sub divided mm and a circumference scale in mm is provided.
Each rule is packed with PVC pouch with instruction leaflet.