Fits Mossberg 500 20 Gauge , Winchester & Browning Invector 20 Gauge (NOT INVECTOR PLUS)
.575" Constriction
Lead, Bismuth, Copper or Hevi-shot can be used in this choke (Not for use with Steel Shot)
Choke has been removed from packaging but has never been shot through.
I have this choke listed on Ebay cause I don't know how to sell it any other way, so link is below
http://www.ebay.com/itm/281709692090?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649