I play with 50mm N40 N48, N52 12.5 and 25mm not nice to get caught with fingers
it hurts a lot ... i got this years ago from italy i use to have 120 of this but now i may have just a few... some were used to build a wind power generator long ago with an old friend...
i´m not sure but i think mines are N52
look this video where he shield the field
