12" Triangular Combination Scale Rule for Mechanical Engineer (1/8, 1/4, 3/8, 1/2, 3/4, 1) and 1:50 hardwood bamboo core Combo Essential tool for Mechanical Engineer. Compare to Staedtler and Helix and Alvin 12 inch triangular scale Includes Open divided ( 1/8, 1/4, 3/8, 1/2, 3/4, 1 = 1 foot.) and 1:50 Machine engraved divisions and color-coded furrows Hi Quality Bamboo Core made in Japan