gotta be careful how far the screw goes in so it doesnt break through to the sole, also where you place it too might form a crack in the rubber where the boot bemds...I have ground off the lugs on the sole with a belt sander an gotten a studded felt sole kit an done that an that works like a charm, just make sure to find out if yer boots are made from rubber or Pvc, if they are rubber you have to use contact cement called barge cement, contact also works, if they are pvc you can use the same glue you use to put pvc pipe together just make sure if you use thta you also get the pvc cleaner/primer.I have done this to two pairs of bootfoot waders i own, redballs were pvc, and Hodgeman 5mm lakestream neoprenes, an they work freakin excellent.