The drill bit extension set includes 150mm and 300mm extension rod, and wrenches. These drill bit extension rods enable effortless change between drill bits, making your work . Whether you are a hobbyist or a professionals, this drill bit extension set is reliable and to use. Features -Color:Silver -Material:Metal -Size:29.80X1.20X1.20cm/11.71X0.47X0.47in -Size:5.00X1.70X0.20cm/1.97X0.67X0.08in -Size:15.80X1.25X1.25cm/6.21X0.49X0.49in -The design of this drill bit extension saves by allowing for easy and fast switching. -With extension rods and wrenches included, this drill bit extension provides flexibility for different tasks and drilling depths. -the drill extension rod is stable during use, allowing for precise drilling, and you can use it nicely. -Made from durable metal, this drill bit extender is built to last and withstand heavy use over time. -Despite its sturdy construction, this drill bit extender is lightweight and compact, making it easy to transport and store when not in use. Package list: 1 x Drill Extension Rod (150MM) 1 x Drill Extension Rod (300MM) 2 x Wrenches