12in T-Marking Square

16ths scale has left to right and centering rule with small drilled holes every 1/16''. 32nds scale has left to right rule with small drilled holes every 1/16''. 3'' scale on top, 2'' rule at the bottom from 1/2'' to 2 1/2''. Angle markings and drilled holes in the center from 0 degree - 90 degree - 0 degree in 15 degree increments plus a 22.5 degree, 25 degree and 67.5 degree. Accuracy: +-0.002''. 5'' L x 1'' H sliding base with 1'' scale markings on rear side. 2 mm solid aluminum frame with a protective anodized finish. Precision laser engraving. Two removable metal locking screws. Supplied in protective case.