Allied Titanium 0008956, (Pack of 5) M6-1 Pitch X 20mm Metric Titanium Flat Head Socket Drive Machine Screw, Grade 5 (Ti-6Al-4V) M6-1 Pitch X 20mm Flat Head Socket Drive Allied Titanium Machine Screw TRUE TITANIUM(TM) - Stronger, Lighter and Corrosion Free Titanium is good for use in or near saltwater General Tolerance: +0/-0.26 mm Meets ISO 10642; Grade 5 (Ti-6Al-4V) Titanium with Polished Finish