They sell a set of 5 bits to fit their magnetic handle which are supposed to fit the screws used in the Colt & clone SAA pistols. Colt SAA screwdriver bits
I have many Brownells bits, but cannot comment on those specific ones. I do have a set of the wooden handled Grace screwdrivers that are specifically ground for the Colt and have been using those for many years. They work well.
I have not been impressed by Grace screwdrivers, the tips on mine purchased in the past few years are not of the correct geometry. I’d buy the bits from Brownell.