Aluminum Alloy, S2 Steel [Professional Grip] Ergonomic low center of gravity drum design, self-drive and smooth rotating cap provide fast twisting and less fatigue. Full metal body and anti-slip texture ensure precise screw [Precision Tough S2 Steel Bits] Rust-resistant bits with specific colors representing different batch heads for quick search and neatly arranged [Transparent & Magnetic Frame Case] Easy and quick access to the bit box at a glance. Never cause any damage whether you use them or not [Various Applications] With the most common types of discs, you will have the essentials without refilling or duplication. Only the items you need to repair tech like phones, game consoles, laptops, drones, desktops and maintain your PC, watch, controllers, even your jewelry, watch and glasses.