About This Complete 12 piece kit: Includes 6 x 1/4" and 6 x 5/16" magnetic nut driver bit set bits to handle common SAE nuts and bolts. The 65mm extended shank reaches tight spaces, while the anti-slip grooves ensure firm grip during high torque tasks Strong magnet design: Each nut driver bit features embedded magnets to securely hold nuts or bolts in place, preventing drops during vertical or overhead work. The magnetic force withstands vibrations from impact drills, saving time on repetitive tasks Universal 1/4 hex compatibility: Fits most standard drills, impact wrenches and socket adapters. The precision machined shank eliminates wobbling for smooth operation. Ideal for automotive repairs, furniture assembly and machinery maintenance Chrome vanadium steel: These bits resist bending, stripping or cracking under heavy loads. The corrosion-resistant coating prevents rust in humid workshops or outdoor environments, ensuring longevity Ergonomic & Safe: Laser-etched size labels ensure quick identification, while the knurled collar allows effortless bit changes. Keeping you on track at work