13pcs cobalt hex drill bits set, including 15, 20, 25, 30, 32, 35, 40, 45, 48, 50, 55, 60, 65mm with 1/4 inch hex shank. Special plug hex design provides improved performance compared to standard pressed hex, helping prevent bit slippage and ensuring secure connection during impact drilling. Cobalt-containing drill bits offer longer lifespan than titanium-coated bits. Fully ground spiral flute allows for quick chip removal, reduced friction and heat buildup, delivering faster, cooler and more efficient drilling. 135-degree split point tip prevents walking and ensures stable, precise drilling without the need for a center punch. 1/4 inch hex shank is compatible with most drills and drill presses, enabling quick, easy and secure bit installation without slipping or disengagement. Suitable for drilling wood, plastic, steel plate (up to 5mm), aluminum alloy and other soft metals. Ideal for DIY projects, household maintenance and repair tasks. Not intended for use on glass, ceramic or concrete. Color: silver. Material: high-speed steel. Package includes: 13 x cobalt hex drill bits. Only the listed items are included; other accessories are not part of the package. Note: Lighting and display differences may cause slight variations in color between the product image and the actual item. Measurement tolerances may vary by +/- 1-3cm.