Lock On is a genre of street art, where artists create installations by attaching sculptures to public furniture using lengths of chain and old bike locks. 
The installations themselves are referred to as "a Lock On" ("singular") or "Lock Ons" ("plural").
Style.
A Lock On is art in a public space, typically attached to a fence or street lamp with some sort of padlock, without permission. The Lock On style is a "non-destructive" form of underground art.
Technique.
Lock On street sculptures can be made from various materials like wood, plastic, clay, concrete, iron, styrofoam or polystyrene. Typically a part of the concept is to re-use found materials. 
In some cases the materials are released in the same neighborhood where it was originally collected, now upcycled into sculptures, following the thought of improving cityscape by the use of materials that used to impair the very same area.
The locks used when mounting street sculptures are, in some cases, dismounted from broken bikes, found nearby.
References.
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