Carbon fiber key Compatible with all standard series handcuffs Made of head treated stainless steel and designed to provide an idefinite period of service Lifetime Guarantee This Zak Tool carbon fiber pocket extension tool is compatible with most handcuff keys and is designed for use by law enforcement officers as a handy accessory.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }