Marine Single/Double Cross Bollard. Crucitorm Bllard, sometimes also call ship's cross bits, is also a type ot ships mooring and towing rittings used on board.our GB/T10106-88 Ship's Cross Bit is made from high quality steel plate, standard range of GBT10106-88 Ship's Cross Bittcaters for a nominal diameter from 100mm to 350mm.This Ship's Cross Bitt can be used to provide secured mooring or be used for towing purposes.