The aesthetic designs of most tools cater towards boys, not girls, which sends an implicit message that tools aren't for girls, and discourages their interest and involvement in building and fixing things. This is unfortunate, because working with tools provides hands-on experiential learning with all four STEM topics: science (e.g. physics, as illustrated through leverage or friction), technology (e.g. laser rangefinders and electronic levels), engineering (e.g. following design drawings), and math (e.g. measuring).
At Petals and STEM, we sell a variety of real tools and toolboxes specifically designed to appeal to girls. We also sell toy tools and accessories to encourage construction-related pretend play. Happy hammering!