- Precise depth control: This aluminum alloy drill bit set features an adjustable depth-limiting mechanism that delivers consistent drilling accuracy, eliminating the frustration of drilling too deep or too shallow in your workpieces and giving you exact hole depth for professional-looking results in metal and wood projects. - Versatile application: Drills effectively on wood, aluminum, and other metals. Compatible with most power drills and designed to maintain cutting integrity while creating clean, precise holes for dowels, cabinet hardware, and joinery work. - High-quality construction: Made from premium alloy steel with special heat treatment that increases hardness and wear resistance, helping the bits maintain their cutting edge through repeated use for reliable performance and faster project completion with less effort. - Quick change system: Tool-free bit installation and removal allows effortless switching between tasks, minimizing downtime and boosting workflow efficiency in woodworking or metalworking projects. - Use scenarios: Install cabinet hardware or door handles with consistent depth across multiple doors; create aligned dowel holes for furniture joinery; drill clean holes in aluminum parts for frames or brackets.