ABUS-03968-Door-Chain-SK79-W-SB-ABUS-03968-p-The-ABUS-03968-Door-Chain-SK79-W-SB-can-be-unlocked-from-the-outside-through-the-door-crack-with-the-key-Manufactured-with-a-hardened-chain-and-easy-to-use-this-excellent-door-chain-is-ideal-for-doors-with-glass-panels-or-thin-metal-sections-p-ABUS-03968-Door-Chain-SK79-W-SB