Alpen | Drill Bit SDS-plus F4 Forte 9,0mm X 160/100mm Makita_Screwdriver the working surface is the

the working surface is the section of the face that extends from about 1/8" below the bottom of the screw slot to the cutting edge

Progressive spiral design for fast results

Made from a new type of steel

Autosol Metal Polish also leaves an invisible film that inhibits oxidation for months

Alpen | Drill Bit SDS-plus F4 Forte 9,0mm X 160/100mm Makita_Screwdriver the working surface is theSDS plus F4 Forte Drill Bit Size: 9,0 x 160 100mm Range of application The SDS plus hammer drill bit F4 with its patented 4X stepped profile and patented tip Low wear, very long service life High efficiency drill bit for heavy duty drilling in concrete, natural stone and brickwork Strengths Efficient Fast Precise for dowel holes Patented carbide tip Excellent centering properties Patented 4 step profile Fast drill dust feed Low wear, very long service