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Rigid Hi precision replacement blades for workhorse combination squares □ can be used as replacement blade for workhorse combination squares or separate machinists rigid rule □ blades are fully hardened and tempered with satin hi-contrast chrome plated finish □ 4R graduation - 8ths, 16th, 32nds, & 64ths □ 16R graduation - 32nds, 64th, 50th, 100th □ in/metric graduation - 32nds, 64th, 1mm, 1/2mm □ meets Federal specs Type VI Class a □ factory certificate of accuracy for graduations lines widths, flatness, straightness & Parallelism, graduation error, centering error, Rockwell hardness.