Part #........ KOU08909A-A Description... STAINLESS CHOKE TUBE Choke......... EXTRA FULL Size.......... 2 7/16" Fits.......... RED LABEL 12 GA. STAINLESS & SPORTING CLAYS WITH SERIAL NUMBER PREFIXES 400- 401- 410- 411- & 420- Note.......... RM CHOKE INSERT IS ROLLMARKED WITH CHOKE MARKING. THE INSERT MUST BE REMOVED TO IDENTIFY THE MARKING.