Idea of Toolbox Icon
It's an image of a toolbox. Is a rectangle with a horizontal line through the center about one third of the way form the top. There are two small rectangles on the horizontal line representing locks. Centered on top of the box is a small rectangle representing a handle.
This Toolbox icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.