This is a 5 pack of relays with harness plugs. They are rated for 30A on the normally closed contact and 40A on the normally open contact. They are meant for automotive use (12V) but they can be used in electronics projects as well. The harnesses make it easy to wire up to the relays (no solder or crimp terminals and heat shrink to deal with).

The high amp rating is enough for most things you would need. The relays and harnesses appear to be high quality and there is a generous amount of wire on the harnesses (about 9″).

They are currently available for $13.87 for 5 relays and 5 harnesses at amazon: http://amzn.to/1OVmdbI

Full Disclosure: I received this item at a discount in exchange for my honest review.