【Heavy-Duty Application】 This magnetic Phillips drill bit is made of chrome-molybdenum alloy steel, integrally forged and deeply heat-treated for improved hardness and toughness. Combined with a high-density built-in strong magnetic core, it firmly holds screws, ensuring stable and reliable tightening even under frequent use. 【Wide Application】 The Phillips head drill bits come in 6 pieces, ranging from 25mm (0.98 inches) to 150mm (5.91 inches), specifically designed for complex scenarios, furniture assembly, appliance repair, automotive interiors, and switch boxes. 【Rust-Resistant & Practical】 The Phillips head impact screwdriver bits feature a standard 1/4-inch (6.35mm) hex shank, compatible with most mainstream electric drills and impact drivers. The surface is treated with black anodization for rust resistance and wear resistance, not easily fading or rusting over time—combining industrial-grade quality with aesthetic practicality. 【Suitable for Confined Spaces】 The included magnetic extension holder can be pre-loaded with screws for convenient single-hand tightening, significantly improving installation efficiency—especially suitable for high-altitude, narrow-track, and other single-hand working scenarios. 【What You Receive】 The set includes 6 magnetic drill bits of different lengths, 1 universal magnetic holder, and 1 storage strip, neatly stored in a shockproof EVA inner case to ensure all accessories are included., Manufacturer: LuLobtg