The KW-triO heavy-duty stapler pins of 23 Series, including models 23/8, 23/10, 23/13, 23/15, 23/17, 23/20, and 23/23, are made of high-quality steel for strong and reliable binding. With leg lengths ranging from 8mm to 23mm, they are designed to fasten from medium to very thick stacks of paper, making them ideal for heavy-duty staplers. These staples ensure smooth penetration, secure holding power, and reduced jamming, providing a dependable solution for offices, school,s and printing/binding shops.