Denew Press Studs Snaps Fasteners Buttons (21mm 40 sets), rust resistant metal coated invisible stitching black buttons, used for wallets, handbags, clothing sewing process DIY supplies Large quantity: Each button is 21mm, large and well crafted. Hand sewing is easy and very stable, which is what some of your sewing projects require. The sewing button is very suitable for your design. Buttons of the same size can be easily replaced, and you will never worry about missing parts, which is enough to meet your different needs High quality material: The buttons used for clothing are made of high-quality copper and high-quality springs, with appropriate elasticity. The buttons are hard, sturdy, and durable. It can be used for a long time and is not susceptible to erosion and rust. Convenient for you to use in daily life Easy to use: Each snap fastener consists of two parts. One side slot of the base tool is used to secure the cover of the snap fastener and prevent the cup shaped cover. The other side projection of the base is used to secure the rivet of the snap fastener and prevent it from hitting, bending, and sliding, making it very easy to install. These two parts can be buckled together and used as fasteners for any sewing project Widely used: These buttons are widely used in clothing, coats, hats, baby diapers, jeans, down jackets, shoes, jackets, cargo pants, windcoats, backpacks, bibs, embroidered towels, leather crafts, DIY crafts or other sewing and home projects