For Pentax DSLR you need JIS crosshead screwdrivers.
I have tried many of them but particular if you need to get into the battery compartment and if you need to unscrew the solenoid, the longer
VESSEL 9902 precision screwdrivers
are the best.
Made in Japan, their heads last very long. I have tried Moody tools which are not bad but I prefer the Vessels.
I know a few Motorbikers who were quite relieved when they JIS screwdrivers for their Japanse motorbikes if crosshead was needed!
I have replaced all my larger WIHA and WERA PH crossheads with JIS as well (again Vessel which are never overprices)
One can always use JIS instead of PH, they fit perfectly, but shouldn't do it the otherway round.
No matter what anybody says, Phillips is now NOT JIS!
Wera Kraftform, as nice as they look, are no longer made in Germany but China and aren't JIS either but PH.
Using PH instead of JIS does damage the screws (and screwdriver)