This is adapter ring, mount allows you to attach any PK Lens to your Canon EF EOS camera body including the DSLR .

Main Features: 

1)This is adapter ring, mount allows you to attach any PK Lens to your Canon EF EOS camera body including the DSLR (10D, 20D, 300D,30D,40D,450D,50D, 350D, Digital Rebel, D60, D30, 1D, 1DS) . This item contains lock pin which will allow you to adjust to infinity focus.  2)Color:silver  3)Material:copper  4)1pcs/high qualified box  5)Packing:200pcs/ctn  6)We have the following items:  Lens Interface        Camera Interface  1,AD-01259 001 Nikon -EOS(silver,made of copper)  2,AD-01259 003 C/Y-EOS(silver,made of copper)  3,AD-01259 002 Leica-EOS(silver,made of copper)  4,AD-01259 004 Rolle-EOS(silver,made of copper)  5,AD-01259 005 Pentax PK-EOS(silver,made of copper)  6.AD-01259 006 Tamron-EOS(black,made of aluminium)  7,AD-01259 007 Nikon-FD(black,made of aluminium)  8,AD-01259 008 Tamron-PK(silver,made of copper)  9,AD-01259 009 Tamron-Nikon(silver,made of copper)  10,AD-01259 010 Kiev-Nikon(black,made of aluminium)  11,AD-01259 011 Kiev-Canon(black,made of aluminium)  12,AD-01259 012 Mamiya-Kiev(black,made of aluminium)    

adaptor ring