rear brake caliper wind tool

[jc..]

before I go off an buy the wrong one...
what is the pattern if any that I need to wind in the rear caliper piston (B5 RS4 calipers)?

does the generic halfrauds/sealer one do the trick?

[s4-99]

I've got a B5 S4 and i bought my caliper wind back tool from Hallys mate...