1. HEAVY DUTY STEEL LOCK: This lock is made of hardened steel and is coated to keep your contents and the bad guys out. The lock weighs a heavy 850g and measures L10 x W2.4 x H6.5cm (3.94 x 0.94 x 2.56 inches). The shackle measures 12 mm in diameter. When locked the gap measures L3.9cm x H2cm (1.54 x 0.79 inches). This makes this padlock the perfect size for most latches. 2. ULTIMATE SECURITY: Weighing at a mighty 850g this lock is super tough. With its hardened, solid steel body it makes it high strength and extremely durable. It has a rotating shackleclosed shackle making this lock anti-drill and anti-saw. The lock has been designed with security in mind leaving no weak spots. 3. 4 KEYS INCLUDED: All of the padlocks sold come with 4 keys. You can never have enough spares. Keep a few in a place so you are covered if you lose one. With 4 keys, you will have enough to give to close friends and family members. Keys can only be removed from the lock when it is in the locked position. 4. LOCKUP AND LEAVE: Given the unique D shape of the lock it makes it the perfect solution for securing industrial 20ft or 40ft containers as well as gates, garage doors, caravans and storage units. Also being very sturdy the lock can be used when locking up the chain on your motorbikes.