Method of joining sintered parts of different sizes and shapes

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A wear resistant tool comprising:

• a plurality of sintered parts, each of the plurality of sintered parts being formed of a hard metal composition of material, at least one of the sintered parts having at least one internal cavity, wherein the plurality of sintered parts can be assembled into a shape of a unitary body;
• and
• a joining surface disposed on each of the plurality of sintered parts, wherein when the parts are assembled each joining surface is brought into contact to form a bonding interface therebetween, such that when the assembled parts are subject to a vacuum or gas atmosphere, without the application of external pressure, and to a temperature sufficient to fuse the plurality of parts, the plurality of sintered parts are joined together at a respective bonding interface to form the unitary body.