12-1/2-Inch x 3/4-Inch x 1/8-Inch Planer Blades Fit for Mophorn Mb1931 Emb1931, Craftsman 12-1/2 Inches Planer, Double Edges (319x18.2x3.2mm) - Set of 2 - Amazon.com
How to Read a Ruler - The Cornucopia Learning Network
Omnigrid Ruler - 12-1/2 x 12-1/2 inches - Walmart.com