This locking pin back. The pin back is made of solid materials. It is safe and durable. It can be used for a long time without being easily damaged. It is an excellent locking pin back that can bring you more convenience, allowing you to have comfortable experience. Features -Color:Silver -Material:Metal -Size:0.50X0.50X0.50cm/0.20X0.20X0.20in -Size:4.50X1.50X0.20cm/1.77X0.59X0.08in - Easy to use, no tools required which allows you to install and remove it easily, handy and convenient for use. - They are good supplies for making DIY crafts. The pin back is tight and not easy to fall off. - These clutch back can be applied to tie tacks, badges, lapel pin, and jewelry making, etc. - It can be applied to lapel pin, tie tacks, service bars, jewelry making, etc., perfect for diy making. - Good replacement for lost backs badges, name tags, etc., very practical and useful. Easy to storage in a portable box. Package list: 10 x Pin Backs 1 x Tool