Hermle Mechanical 135 mm Brass Serpentine Hand an FHS brass serpentine clock hand. Fits the majority of Hermle mechanical movements with the exception of models 471, and 1171. Minute hand has a square hole 2.5 mm x 2.5 mm with a length of 135 mm. Hour hand has a round hole diameter 4.5 mm with a length of 87 mm.