WEST 917

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The 917 is a dimple lock made by the Japanese company WEST.

Principles of operation
The WEST 917 contains 20 pins, arranged in rows of seven on the left and the top of the keyway as well as six on the right. It also contains a core-centering ball bearing.

The pin chambers on the sides of the core have counter milling as an additional defense against lock picking. The 917 contains multiple security pins: both regular and mushroom driver pins as well as spooled and tapered multiple spooled key pins. The key is bitted on the sides and edges of the blade and is reversible.