We have metal book rings with different sizes and colors, and O,D and other ... figues. We are professional manufacturer of metal book rings and clips in China.The sizes are 15cm, 20cm, 25cm ... , 32cm,38cm,50cm, 60cm, 75cm, and the colors have silver, green, blue, red, black and other colors.We can sell as ... , pls feel free to contact us.Best regards,Johnny book rings