Abstract: A buckle includes: a plug member which includes support arms formed at both ends in a forward direction of a base, and a support part formed forward from the base between the two support arms; a socket member that includes support chambers formed at both ends where the support arms are inserted, a central chamber formed between the two support chambers and having an open front, a retained part formed at the rear end of the central chamber, and a first magnet embedded inside the central chamber; and a locking member which is rotatably mounted on the support part, and includes a second magnet embedded in the center to correspond with the first magnet when the plug member and the socket member are coupled.

Abstract: A strap bar device includes: a strap accessory which includes two support parts facing each other to be spaced apart from each other, and a through-hole and a support groove formed in the two support parts to face each other; and a strap bar which is inserted through the through-hole and is supported in the through-hole and the support groove. A strap is connected to the strap bar.

Abstract: A buckle with a whistle includes: a plug member having lock arms extending forward from both sides of a base and a guide rod extending forward from the base in such a way as to be located between the lock arms; and a socket member having a chamber open on the front end thereof by means of an upper plate and a lower plate located to face each other so that the socket member is coupled to the plug member. The chamber is allowed to accommodate the guide rod therein. The guide rod is configured as the whistle. When the plug member is coupled to the socket member, the whistle is accommodated in the chamber.