Versatile hole saw system with adjustable opening and related drill accessories. Includes hole saw, opener, bore cutter, drill bit, and other parts for round cutting in multiple materials. Key features - Accurate, adjustable scale for precise hole sizes - Opening diameter range: 30 mm to 200 mm - Broad applicability across materials and projects - Designed for use with a drill, with parts and accessories included Materials and applications - Cuts round holes in wood, metal, drywall, and plywood - Suitable for carpentry projects and general woodworking tasks Benefits - Enables large, clean, round openings with a single setup - Flexible tool set that expands drill capabilities - Easy to adjust for different hole sizes, improving accuracy and efficiency Use scenarios - Install electrical conduits or plumbing by cutting large round openings in wood or drywall panels - Create cable pass-throughs or ventilation holes in plywood or wooden boards for furniture or cabinetry - Prepare sizable openings in metal or composite panels for fixtures, hardware, or wiring This kit provides the essential hole cutting, opening, and drilling components you need for woodworking, carpentry projects, and general drill-related tasks, with an accurate, adjustable scale and a 30–200 mm diameter range for versatile use.