ALWAYS SUITABLE - Allen key set in MM: 0.7 mm to 10 mm as well as 0.028 to 3/8 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", 1/2", 1 /16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5 /16" and 3/8" 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