The EKLIND 15508 Metric Plain Hex Key is the perfect tool for those working with small fasteners. It has a tip size of 4 mm and an arm length of 2 43/64 in. Made from alloy steel, this hex key features a black oxide finish that helps to prevent corrosion. The plain handle offers you greater control over the hex key when working with small fasteners. With a 1 in handle length, it allows you to reach into tight spaces where other tools cannot fit. This EKLIND Hex Key is an essential for your toolbox.