IRB REGULATIONS -- LAW 4.3
Studs/cleats of player's boots must conform with IRB Specifications
(Regulation 12), must not be longer than 21 mm, and must not have any burring or sharp edges.
The stud will be free from serrated edges, and not made of metal or had plastic which will burr when scrapped on a ground based rough surface.
In general the heel studs used in football boots can meet the requirement - however you must be aware of aluminum as these are not covered.
You may also use standard molded soles where the stud is fixed and not replaceable
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