Dead Beat Escape Wheel FHS 43 to 94 cm is an escape wheel specifically for Dead Beat Movements 141, 151, 241, 351, 451, 1051, 1151, 1161 and 2061. Dead Beat Escape Wheel 43 to 55 cm is specifically for movements with a pendulum length of 43, 45, 48, 55 and 94 cm. Pendulum length is indicated on the plate of the clock, it is not the actual measurement of the pendulum.