Manufactured from a premium grade of M-7N molybdenum high speed steel.˜ the Nitro Heavy Duty 135 degree Split Point drill with a Nitride surface treatment that give a hard protective layer to the drill (increases hardness without increasing brittleness) which is measurably harder than high speed steel.˜ Body and clearance are gold and black surface treated for maximum lubricity.˜ Recommended for use in stainless steel and other hard metal drilling. Package qty. 6. Size 7/16". Overall length 5-1/2". Flute length 4-1/16"
Nitro Heavy Duty 135° Split Point drill with a Nitride surface treatment that give a hard protective layer to the drill (increases hardness without increasing brittleness) which is measurably harder than high speed steel.˜ Body and clearance are gold and black surface treated for maximum lubricity.˜ Recommended for use in stainless steel and other hard metal drilling. Package qty. 6. Size 7/16". Overall Length 5-1/2". Flute Length 4-1/16" made premium grade of M-7N molybdenum high speed steel
