A knife may include a blade having a first side face and a second side face. The blade may include zirconia as a main component, and include a cutting region including at least a ridge portion between the first side face and the second side face. When a portion including the cutting region in the first side face is referred to as a first cutting face, and a portion including the cutting region in the second side face is referred to as a second cutting face, the proportion of cubic crystals of zirconia in the first cutting face may be larger than the proportion of cubic crystals of zirconia in the second cutting face.

A knife may include a blade having a first side face and a second side face. The blade may include zirconia as a main component, and include a cutting region including at least a ridge portion between the first side face and the second side face. When a portion including the cutting region in the first side face is referred to as a first cutting face, and a portion including the cutting region in the second side face is referred to as a second cutting face, the proportion of cubic crystals of zirconia in the first cutting face may be larger than the proportion of cubic crystals of zirconia in the second cutting face.

A folding utility knife comprises a handle, an angularly movable blade holder, blade holder locking mechanism and a cutting blade with a cutting edge and an opposite indexing edge having a first indexing notch, a second indexing notch and a third indexing notch. A blade locking mechanism has a locking pin for locking engagement with the first indexing notch, the second indexing notch, and the third indexing notch holds the cutting blade in a first blade position, a second blade position and a third blade position, respectively. The cutting blade is removable and rotatable 180 degrees for re-insertion into the blade holder whereat locking engagement of the locking pin with the third indexing notch, the second indexing notch, and the third indexing notch holds the cutting blade in a fourth blade position, a fifth blade position and a sixth blade position, respectively.

A safety blade for use with a knife assembly having a handle with a cutting head engagement portion, the safety bade comprising (a) a blade body, a bade attachment having a first inner edge and a second inner edge, a first blade shield, a second blade shield, a first blade cutting edge, and a second blade cutting edge, and (b) a handle adaptor having a body portion and a handle engagement portion with a handle securing mechanism. The first blade cutting edge is positioned between the first blade shield and the first inner edge, and the second blade cutting edge is positioned between the second blade shield and the second inner edge.

A safety blade for use with a knife assembly having a handle with a cutting head engagement portion, the safety bade comprising (a) a blade body, a bade attachment having a first inner edge and a second inner edge, a first blade shield, a second blade shield, a first blade cutting edge, and a second blade cutting edge, and (b) a handle adaptor having a body portion and a handle engagement portion with a handle securing mechanism. The first blade cutting edge is positioned between the first blade shield and the first inner edge, and the second blade cutting edge is positioned between the second blade shield and the second inner edge.

The present invention is a multipurpose machete assembly comprising of a no tool removable handle/scales, a ferrocium rod or bottle with cap holder or mount and a multi-purpose blade. The blade has a spur knife for precision work, a gut hook, a spear point/digging point, a recessed area for holding dirt, a cooking pan, a special toothed high efficiency saw, a hook/gaff, a forward lanyard hole, a hammer/pommel/knob, a flat area for scrapping, a long strait or flat section for using as a draw knife, and holes through blade for processing cordage.

A kitchen knife featuring a secure handle formed by an angled slot located above the cutting edge receiving the fingers of a user and a grip located above said slot and attached to the blade piece, the angling of the grip and slot eliminating any twisting of the user's wrist and having an ergonomic effect in executing cutting, chopping or a slicing motion with the knife.

A knife is provided having both a multi-blade configuration for cutting multiple slices simultaneously as well as a single blade configuration for storage and single cuts. In some embodiments, the multiple blade configuration may be adjustable to define varying distances between the multiple blades.

A knife is provided having both a multi-blade configuration for cutting multiple slices simultaneously as well as a single blade configuration for storage and single cuts. In some embodiments, the multiple blade configuration may be adjustable to define varying distances between the multiple blades.