The Black Tiger Automatic knife is a very heavy duty knife. It has a fairly large size, but more importantly, it has a sharp tanto blade. This tanto blade provides an additional sharp edge to cut. It has a solid spring action, but an added thumb stud. The hidden release feature sets this knife apart from most other automatic knives. The handle is made of aluminum for greater strength and balance. The safety locking blade function is better known as a lockback, because of the way it locks. Overall Length: 8 Inches. Blade Length: 3.5 Inches. Blade: Tanto, Fine Edge, Sharp, Stainless Steel. Handle: 4.5 Inches, Aluminum. Features: Auto, Hidden Release, Lockback.