General description This versatile extension bar set includes three different specifications (1/2in, 1/4in, 3/8in) of spring steel extension bars, providing you with the right tool for various situations. Meet all your needs with just one purchase. Technical specifications Material: High-quality spring steel Specifications: 1/2in, 1/4in, 3/8in Usage Compatible with electric drills, rechargeable drills, and manual wrenches Ideal for tasks such as car engine repair, equipment maintenance, and furniture assembly Other information Equipped with a lock and magnetic device for a secure connection Designed for easy access to narrow and hard-to-reach places Durable construction with high hardness and excellent flexibility