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"1" bitted cylinders are supplied with two key blanks that are uncut. They can be keyed locally to an existing key system. Construction cores are supplied with two operating keys per core and one control key per order. These cores are keyed to a common key and should not be used for permanent security. Temporary Construction Cores are not subject to our standard return policy and Cannot be Returned. Keyed cores come with 1 Control key to install/remove the core and 2 operating keys.