The Renz 321270123 binding elements are premium-grade wire combs designed for professional document finishing and high-end presentations. These 12.7mm (1/2 inch) black wire rings are specifically engineered for a 2:1 pitch (2 holes per inch), making them compatible with all standard 2:1 wire binding machines. Capable of securely holding up to 100 sheets of 80gsm paper, these A4-length elements feature 23 loops for a perfect fit. The high-quality nylon-coated steel construction ensures the spine remains rigid and perfectly circular after closing, allowing pages to rotate 360 degrees for easy reading and photocopying.