fibergalss hollow core bit
Fiberglass Core Bits are designed for drilling through utility poles made from fiberglass and/or composite materials.
Fiberglass Hollow Core Bits - Carbide Tipped page 177C
Carbide Tipped Fiberglass Hollow Core Bits were developed for major utility drilling through thick wall hollow core utility poles made from fiberglass/composite materials. They are manufactured with a ground short wide flute and narrow land and can be resharpened.
Fiberglass Solid Core Bits - Carbide Tipped page 177C
Carbide Tipped Fiberglass Solid Core Bits are designed for drilling solid/foam core utility poles and cross arms made from fiberglass, resin and composite materials. They are manufactured with full flute and solid body to be able to drill through fiberglass/resin/composite poles. The full fluting allows bit to remove debris from the hole without melting it.