General description High-quality titanium step drill bit set designed for efficient drilling in various materials including steel, brass, wood, and plastic. This set includes three different sizes to accommodate a range of drilling needs. Technical specifications Material: High-speed steel with titanium coating Sizes included: 4-12mm, 4-20mm, 4-32mm Usage Ideal for drilling in steel, brass, wood, and plastic Vibrates less than traditional twist drill bits for smoother operation Features a clear scale for precise measurements Other information Anti-slip groove design for better grip and stability during drilling Reduces friction and heat for enhanced durability