Makita Thruster Style Percussion Bits feature a carbide tip engineered to penetrate on contact for fast whole starts. The bits are made from special heat-treated high alloy steel for longer life. The Thruster Style ground flute design allows for efficient dust removal.
From the Manufacturer
Thruster Style carbide tip penetrates on contact and plows through rebar. Thruster Style reinforced ground flute for efficient dust removal. Specially heat treated High Alloy Steel for longer life Aggressive cutting edge for fast and easy penetration. Re-sharpenable for extended life.