Original Kawasaki part number for the rotor puller screw is 57001-1099
The thread size should be 18 x 1.5 mm as far as I have found out. But no guarantee for that, sorry!
Quality should be at least 8.8 or better.
Length of the thread should be -rough estimation- 5 cm or longer.
Puller screw with to short thread can’t be screwed in far enough to press against the crankshaft and will get stuck in the rotor itself without doing the required job.
Such a screw should cost below 5 Euros! Do not spend a fortune for it.
Some light trucks from Mercedes Benz use these kind of screws to fix their wheels.