"Invisible" Replacement Tubes For Popular Screw-In Choke Systems
Beautifully made tubes with an extremely smooth inside finish and an undercut, tube-to-barrel joint to minimize shot and wad fouling buildup. Both Win-Choke® and Tru-Choke™ tubes are "invisible" style, no unsightly "knob" sticks out. And, they can't rust; they are stainless steel. Install/remove with a quarter. WARNING: FOR USE WITH LEAD SHOT ONLY.
Big Book Catalog, Issue:73, Page:200
SPECS: Approximately 1-1/2" (3.8cm) long. Stainless steel. Threads are as follows - Win-Choke® Invisible 12 gauge are .812"-32 tpi.