OSF stands for "Open Source Folder". This is a simple made knife. Jake Hoback wanted to make something that a new knife maker could duplicate without fancy machines and materials. This knife was born.
This knife is a thick modified sheepsfoot blade in S35VN. The handle to blade ratio is made so that it is easy to deploy and sturdy enough for heavy use.
This knife comes in a variety of colors, coatings and options. All are great.