Is this padlock really rust-proof?

The body and shackle are 304 stainless steel, which resists rust and corrosion far better than plated steel or brass. It is not fully rust-proof in saltwater or constant wet conditions, so a drop of lubricant in the keyway helps.

Will the long shackle fit my gate hasp?

The shackle is 50mm long and 9mm thick, so it clears most standard gate hasps and thick latch plates. Measure your hasp opening before buying if it is unusually deep or narrow.

How does it compare with a brass padlock?

Stainless steel holds up better outdoors than brass in rain and humidity, and the 9mm shackle is thicker than most brass padlocks of this size. Brass is still fine for indoor lockers where weather is not a factor.

Can I get more keys or match it to another lock?

Four keys come in the box. Nothing in the product details says extra keys can be ordered or that the lock can be keyed alike with another SharkByte padlock, so plan on using it as a stand-alone lock.

What is it best used for?

Gates, sheds, lockers, toolboxes and storage units. It is a general-duty weather-resistant lock, not a high-security lock for valuable equipment left unattended.