197593 Disston Company 197593 Master Mechanic, 13/64 x 3-5/8, High Speed Steel With Cobalt Drill Bit, 135 Split Point, Jobber Length, Straight Shank, 135 Split Point Design With 4 Cutting Edges Allows Quick Penetration Eliminates Walking, 8 Percent Cobalt Content Provides Heat Resistance Delivers Maximum Cutting Efficiency At Temperatures In Excess Of 1000 Degree Fahrenheit, Recommended For Drilling In Hard Metals Such As Heat Treated Steel, Stainless Steel, Chrome, Manganese Steel Plus Titanium Armor Plate, Carded.