Rotatable cutting tool-tool holder-base assembly

A tool holder-base assembly wherein the base is adapted to attach to a surface of a rotatable driving member, the tool holder-base assembly comprising;

• a base;
• the base contains a tool holder bore having a tool holder bore central longitudinal axis, the base further contains an orientation bore having an orientation bore central longitudinal axis, the orientation bore opens into the tool holder bore, the orientation bore central longitudinal axis being disposed generally perpendicular to the tool holder bore central longitudinal axis;
• a tool holder having a leading head region and a trailing shank region, and a mediate region intermediate of and contiguous with the leading head region and the trailing shank region;
• the leading head region of the tool holder contains a rotatably cutting tool bore;
• the trailing shank region containing an orientation slot;
• the mediate region presenting a forward protective surface defining debris diversion surfaces and wherein the forward protective surface comprising a pair of opposite lateral sections, and each one of the lateral sections containing a hard plate;
• and
• an orientation pin received within the orientation bore so as to project into the orientation slot wherein the orientation pin cooperates with the orientation slot in the tool holder so the tool holder presents a correct orientation relative to the base.