Comprehensive Kit: This set includes 30 dual-ended 3/16 inch coballet drill bits, perfect extensive drilling requirements. optimal operation by maintaining moderate speed, pressure, and cool temperature during use to enhance bit . Precision Crafted: Each bit measures approximately 1.89 inches in length, crafted from robust M35 high-speed steel. Their construction ensures durability, resistance to heat, and minimal wear, allowing for precise and stable drilling every time with various drills including lithium, hand, and impact drills (not included). Enhanced Efficiency Design: Featuring a double-ended twist design, these bits offer two cutting points to separately drill holes, doubling your work efficiency. The 135-degree split point and twist shape promote faster drilling and precision. Versatile Utility: Suitable for piercing through tough materials such as stainless steel, titanium alloys, cast iron, and hard plastics. These bits also gracefully handle softer materials, making them an essential for both professional and DIY projects. Long-lasting Quality: Manufactured for durability and reliable performance. The M35 steel composition withstands prolonged usage even under stressful conditions, ensuring each bit remains a vital component of your tool kit for years. Colour:Photo Color Material:Metal Size:M35 There may be differences in color among different production batches, which does not affect use. Package Contents: 30x drill Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.