14mm chain with disc lock. Sold Secure Gold. The legend is back! Kryptonite's ultimate bicycle security for urban areas. Most security conscious chain.14mm six-sided chain links made of 3t hardened manganese steel for ultimate strength. Durable, protective nylon cover with Hook-n-Loop fasteners to hold in place. The Kryptonite Fahgeddaboudit includes maximum security Kryptonite New York Disc Lock with 15mm MAX-Performance steel shackle.