Construction This tool is made from strength alloy steel, delivering longlasting performance and resistance to rust and wear for reliable use in demanding tasks. Comprehensive multifunction kit Includes a wellorganized storage box and essential components: 4 styling heads, 1 reamer, and 2 chucks. The organized kit supports efficient transport and quick access to tools. Engineering Features a rotary adapter and a robust flared cone. Provides 9 reaming sizes with an expansion range of 3 mm to 19 mm for precise results across various applications. Ergonomic design Designed for user comfort with a comfortable grip that minimizes fatigue during extended use. Includes a laborsaving mechanism for effortless operation. Use scenarios Hole finishing and sizing in metalworking or woodworking projects that require precise diameters from 3 mm to 19 mm, using the rotary adapter with the reamer. Component preparation and : swap and use the 4 styling heads with the 2 chucks to fit different parts, then store everything in the included box for easy transport. Onsite repairs and field projects: portable kit with a comfortable grip and laborsaving mechanism to perform extended reaming tasks with reduced fatigue.