The special lip-edge on this ruler works like a T-square against the edge of an Olfa mat and it offers perpendicular lines and angled bias lines.
O'Lipfa 66636 Ruler with Lip Edge, 4 x 36-Inch
O'Lipfa 11111 Ruler with Lip Edge, 5 x 24-Inch
O'lipfa 3 x 18 Lip Edge Ruler - 021251163184
O Lipfa Ruler for sale
O'lipfa 3 x 18 Lip Edge Ruler - For Quilting, Sewing, And Crafting - Dutch Goat
O'Lipfa 11111 Ruler with Lip Edge, 5 x 24-Inch
O Lipfa Ruler for sale
O Lipfa Ruler for sale
O Lipfa Ruler for sale
O'Lipfa 16318 Ruler with Lip Edge, 3 x 18-Inch , White