The lip edge works like T-square.
Specifications
Openings at intersecting inch grids for accurate cutting. The numbers run in both directions at each end for both left- and right-handed cutting.

Note: It does not have an accurate 90 degree measurement and should not be used as such. The Omnigrid Omni-Edge rulers are 100% accurate.
Other Images

icon O'lipfa OL111 5x24in Lip Edge Ruler, Openings at intersecting inch grids

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