This is a pair of interlocking discs, either metal or plastic and sometimes referred to as a snap, popper or press stud. Used in clothing or accessories such as purses and handbags and the smaller size suitable for childrens clothing as they easily snap open and close. Brass 21mm, rustproof with positioning hole. Underpart flanged. Rounded edge won't damage fabrics. Comes in a range of colours and sizes. Pack contains: 3 per card.