Olive Knuckle Hinges are named for their unique design that breaks the hinge pin out of the main body into an olive-shaped piece called the "knuckle". Olive Knuckle Hinges are available in a range of sizes and finishes.
Spring Hinges are named for their powerful springs they use instead of pins. Spring hinges have a very high closing strength, and are not appropriate for most houses. However, if you've got a big heavy door then a set of spring hinges might be just the thing!