Mr-S-Leather Stainless Steel Ice-Lock - Small - Pair
http://www.amazon.com/gp/product/B003VSTQ8U?tag=sukses2015-20

Mr-S-Leather Stainless Steel Ice-Lock - Small - Pair
A timed Stainless Steel Lock for the Self-Bondage enthusiast - Attach your favorite restraints with Locks
Approximate Time Length Small 45 minutes Large 2 hours
Manufactured Exclusively for Mr-S-Leather - Beware of cheap imitations
This is such simple mechanical technology that nothing can really go wrong with this device
Made in the USA