This is the lock that the Lock Picking Lawyer from YouTube recommends!

High Security

• 10mm six-sided chain links made of 3T Manganese Steel
• Chain secures Directly To Hardened Deadbolt - offers no 'weak' link in the chain due to the extensive holding power of the link itself against attacks
• Higher Security Disc-style Cylinder is pick and drill resistant
• 3 Stainless Steel Keys — including new key design and one LED Replaceable Key FOB
• Sliding Dust Cover to protect from dirt and debris
• Weather-resistant Nylon Sleeve prevents scratches to painted finishes; compact coiling for easy carrying
• Length: 35.5" (90cm)
• Weight: 6.10 lbs (2.77 kg's)