Fully enclosed stainless steel cover, the C3N by Sphyke has been designed as the ultimate bike accessory for preventing the theft of your wheels and your seat. Developed to stop thieves from breaking in with modified picking tools and common screw drivers, the C3N combo lock device features high tensile stainless steel reinforced skewers, that unlike systems that use nuts and bolts, features 2,000 different possible lock combinations.