Includes 9 pieces ball end inch hex key wrenches: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm. Ball ends allow up to a 25-degree entry angle to reach around obstructions. Chamfered, straight ends offer a snug fit and insert smoothly into fastener head, reducing wear. Short arm design offers extended reach on one end and extra leverage on the other. Made from industrial strength carbon steel in a beautiful chrome silver. The Allen hex key set comes with hinged storage case that opens flat, so its easier to access and replace the wrenches. What's more, the case presents an easy to read size identifier to provide easy identification and fast selection. Allen wrench set is designed with a ball end to access socket cap screws with up to 25-degree entry angle, the qualified long arm hex key set can give you greater access to hard to reach areas. You can find these particular types of fasteners on anything from automotive repairs to household maintenance, plumbing jobs, small engine repair and even in delicate repairs such as watches and jewelry music boxes. Key Size: T101.5mm T152.0mm T202.5mm T253.0mm T274.0mm T305.0mm T406.0mm T458.0mm T5010.0mm Ball hex ends allow entry angle to reach around obstructions Heat treated chrome vanadium steel Precisely-sized, chamfered ends insert smoothly into fastener head, reducing wear Easy to read sizes