Wholesale Puncture Tools
These key chain are light weight.and great for keychains or while on a run.very suitable work on night shift and walk home girls,ladies,women.
The grooves design can help to keep it from slipping in your hand.
Sure it would make a good window-breaker too (Please definitely wrap your hand with a coat or something).
About use self-defence key chain to breaker car window : Just aim for a corner! (Car windows have a plastic layer inside them to prevent a person from getting seriously injured if they are thrown against the window.) The metal frame at a corner limits the flexing and makes it easier to break a window there.