GUN DRILL DIA.20.5X490-MSpecification Details Type Gun Drill (Single Flute Deep Hole Drill with Coolant Through) Diameter (Dc) 20. 5 mm Overall Length (OAL) 490 mm Effective Drilling Depth Typically 20D or more (depends on machine and setup) Material Carbide tipped head with steel or HSS shank Shank Type Cylindrical or straight shank (depending on manufacturer) Coolant System Internal coolant channel (for oil or coolant through system) Coating Optional (TiN, TiAlN, etc. if
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