280 T/SE14 Set of 14 hexagon (allen) keys - (280 T/2-2.5-3,3.5-4,4.5-5-7-8-9-10-12-14, 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.