ALWAYS SUITABLE - Allen key set in MM: 0.7 mm to 10 mm as well as 0.028 to 3 or 8 inch DURABLE - Professional extra long hex key set, for hex screws metric sockets, durable grade 45 steel MULTIFUNCTIONAL - Equipped for all purposes. Whether precision machine screws or microelectronics - with our hex socket wrench set you have a solution for everything. ROBUST - Corrosion resistant thanks to nickel-plated finish , stable tool for amateurs and professionals ALWAYS READY TO USE - Quickly at hand thanks to the practical plastic holder for orderly storage, FREE universal knife describe: Made of industrial grade chrome vanadium steel SAE long arm dimensions include: 0.028", 0.035", 1 or 2", 1 or 16", 5 or 64", 3 or 32", 7 or 64", 1 or 8", 9 or 64", 5 or 32", 3 or 16", 7 or 32", 1 or 4", 5 or 16" and 3 or 8" Metric short arm dimensions include: 0.7mm, 0.9mm, 1.3mm, 1.5mm, 2mm, 2.5mm 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm and 10mm include: 15 SAE Long Arm Allen Keys (1 of each size) 15 Metric Short Arm Allen Keys (1 of each size) 1 box hard-wearing and easy-to-carry storage