  We conduct a novel study to obtain the initial spin of the primordial black
holes created during a first-order phase transition due to delayed false vacuum
decay. Remaining within the parameter space consistent with observational
bounds, we express the abundance and the initial spin of the primordial black
holes as functions of the phase transition parameters. The abundance of the
primordial black holes is extremely sensitive to the phase transition
parameters. We also find that the initial spin weakly depends on all parameters
except the transition temperature.
