Set of eight keys 280 T/SE8 - (280 T/2-2,5-3-4-5-6-8-10 mm) - For Allen screws - Silicon Chrome Vanadium steel - Chrome plated finish with burnished tips up to size 8 mm to ensure precise measurement and perfect fit with the screw- Weight 1 kg - These are the best allen wrenches on the planet. We have used these every day since 1995 and they work, and last forever.