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8 mm Rod Rolling Parallel Ruler
This 150 mm drafting ruler rolls on a 142 mm piece of 8 mm smooth rod captured inside it, so you can draw evenly spaced parallel lines and hatching without a T-square or drafting board. The rod turns in an 8.3 mm slip-fit tunnel and sticks out about 0.6 mm through a bottom slot. An M3x10 self-tapping screw stops the rod sliding out of the open end. The ruler has bevelled drawing edges on both sides and 10 mm tick notches along one edge.
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