Created for the purpose of long life and making perfect drill holes on a CNC router, these solid carbide drill bits don’t exhibit the short life, deflection, and low quality holes normally associated with standard high speed steel “off the shelf ” drill bits. Most CNC router tooling is not designed for plunging straight downward into the material; doing so will exert high load force onto the face of the spindle bearings causing pre-mature failure. Using proper tools like a drill bit designed for plunging will save your spindle from unnecessary wear & tear.