Three different tubes for three very different Remingtons...as stated above, standard Remchokes for most Remington branded guns like the Express, Wingmaster, 1100, 11-87. Another for the new stuff ProBore. The third was a special one for the Baikal made stuff from Russia. None of the three interchange but if you have a standard bore, made in the USA Remington the Remchokes are correct.