through 6 and 7b the structure and function of the bit holder block and cutter bit combination 10 according to the present invention will be detailed with greater specificity as depicted in fig2 the bit holder block 12 and cutter bit 14 of each bit holder block and cutter bit combination 10 is structured such that the cutter bit is releasable from the bit holder block the releasability of which as described hereinbelow is controlled by a retainer clip 22 the bit holder block 12 according to the present invention is composed of a singular metallic piece an example of a suitable construction material is steel preferably aisi 864oh but other suitably strong and durable materials can also be used the bit holder block 12 is structured in a predetermined configuration which provides strength at locations of known stress caused by the forces acting on the cutter bit 14 during operation as will be discussed in detail hereinbelow a foot portion 24 of the bit holder block 12 is generally v shaped and is provided with a plurality of surfaces as follows a flat front surface 26 a flat rear surface 28 located opposite the front surface a flat left surface 30 a flat right surface 32 located opposite the left surface and a bottom surface 34 located contiguous the aforementioned surfaces as shown in fig5 and 6 for.