Shear bolt for Polar 76 and 78 Paper Cutters. (027920, 017605) Fits most Polar 76, Polar 76 EM, Polar 78, Polar 78 X, and Polar 78 ED paper cutters. The main shank is 50mm (2") long below the head. It has an M12 thread. Included with each of these shear bolts is a mating washer faced hex nut and a steel roll pin. The roll pin is supplied already installed in the head. The head measures 22mm (.86") in diameter by 9.5mm (3/8") thick.