Features: Crafted with HRC60 hardened stainless steel drill bits, this aluminum profile step drill effortlessly penetrates up to 6mm thick aluminum, offering double the lifespans of conventional steel drills for long lasting performances. Integrated guides and a precisions hole punching jig ensures accurate positioning with less than 0.5mm deviation, eliminating post drilling adjustments for professional result. Designed for enthusiasts, professional craftsmen, and small workshops requiring practical tool for intricate aluminum extrusion projects. Achieve holes in 20/30/40 series aluminum extrusion profile during furniture assembly, architectural installations, or workshop fabrication with easy setups and portable operations. The adjustable copper column and modulars design enable seamless compatibility across multiple profile widths, delivering unmatched versatility for industrial and hobbyist metalworking applications. Specifications: Component:Metal 6mm: Small diameter 6mm, large diameter 10mm 8mm: Small diameter 8mm, large diameter 14mm Attributes: 6mm/8mm Package Includes: 2Pcs Aluminum Profile Step Drill Bit note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.