The comprehensive 7 piece drill guide accessory set ensures reliability through materials construction while maintaining drilling accuracy across multiple job types Ideal for professional woodworkers, metal fabricators, and enthusiasts requiring millimeter levels precisions in drilling applications Perfect for workshop projects, construction sites, or home repairs where consistent hole depth and alignment are critical for materials like cabinetry, plumbing fixtures, or automotive parts Crafted from hardened aluminum alloy bodies and 304 stainless steel set screws, this versatile set resistant and quick adjust functionality for effortless installation Achieve drilling accuracy with these 7PCS drill bit collars featuring depth stop rings that deviation during operations, suitable for 3-12mm bits across wood, metal, and materials, Manufacturer: RGYBAO