Sturdy & Metal Construction: Our loose leaf book rings are made of tough steel that can withstand heavy use. Rustproof steel provides long-lasting use without damaging papers Easy to Open: Features easy opening and firm closing clasp, snap-lock closure offers quick, simple way to fasten materials. Bigger size: These metal rings for paper are ideal for fastening any size document stack, and also are great for variety of uses such as loose-leaf, memo filing, key rings. Multi-purpose Rings: Versatile tools for office, classroom or home, suited for swatches, sample holders, and bulky loose leaf material and more. Book Ring in Bulk: Provide set of 50 large book rings with more cost-effective, enough to meet your daily needs.