Hermle Mechanical 76 mm Black Serpentine Hand an FHS black 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 76 mm. Hour hand has a round hole diameter 4.5 mm with a length of 51 mm.