Description Quick release magnetic bit extension set, different size of our bit extensions, fit most drill bit. Made of high carbon steel, high hardness, wear-resistant, large torque, long service life, 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 magnetic 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. The inner magnetic 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.