blade angle configuration of the invention minimizes the possibility of particles of wood or other material becoming trapped between the blades in the preferred embodiment illustrated in fig1 4 two identical blades 26 and 27 are installed into the blade holders 28 and 29 and each blade has on its mounting end 24 one 45 degree chamfered corner 31 the pocket 32 in each blade holder has an equivalent 45 degree chamfered corner such that the blade can only be installed in the correct direction the need for this will become obvious in the next paragraphs each blade has on its mounting end 24 typically two holes 39 for the purpose of securely mounting the blades to the blade holders by means of screws or other appropriate fasteners a practitioner skilled in the art will recognize many ways to securely fasten the blades to the blade holders including but not limited to the use of screws bolts nuts t nuts or snap in means with or without the use of specific fasteners or holes in the blades and all are considered within the scope of the invention the blade teeth 25 are configured in a way that facilitates cutting deep into the wood or other material without binding and which configuration clears particulate matter such as dust away from the teeth while resisting the tendency of the particulate matter such as dust to become trapped between the blades and which configuration avoids the tendency for the blades to catch and jump away from the precise location of the intended cut as shown in fig5 on each of blades 26 and 27 half.