Auto Beat Escape Wheel FHS 451 26.5 to 38 cm is an escape wheel specifically for Auto Beat Movements 141, 151, 241, 351, 451, 1051, 1151, 1161, and 2061. Auto Beat Escape Wheel 26.5 to 38 cm is for movements with pendulum lengths of 26.5, 27, 29, 31, 32, 34 and 38 cm. Pendulum length is indicated on the plate of the clock, it is not the actual measurement of the pendulum.