Quick release bit extension , different size of our bit extensions, fit most drill Made of high carbon steel, high hardness, wear-resistant, large torque, , smooth and not easy to tear and wear, ensuring your long term use. Features -Color:Silver -Material:High carbon steel -Size:15.00X0.64X0.64cm/5.89X0.25X0.25in -Size:10.00X0.64X0.64cm/3.93X0.25X0.25in -Size:6.00X0.64X0.64cm/2.36X0.25X0.25in -Length Specification: 150mm, 100mm, 60mm - The inner design brings tight connection and makes the drills not shake or fall off easily. - This drill bit extension tool kit is durable and helps you solve more problems quickly. - Made of high carbon steel, which features good strength and offers good corrosion resistance. - Offering different lengths, and can compatible with 1/4 inches hexagonal handle, useful to use. - Our bit extension kit is professional and reliable, providing versatility to fit different tools. Package list: 1 x bit extension rod 150mm 1 x bit extension rod 100mm 1 x bit extension rod 60mm