Item Type: Flexible Extension Bar Material: Spring steel External Treatment: Phosphate Black Specification: 1 x 1/4in 1 x 3/8in 1 x 1/2in 13 Specifications: This kit includes 3 different specifications of spring steel extension bar, respectively are 1/2in, 1/4in, 3/8in to meet the needs of different situations 2Function: The extension holder can easily attach the narrow places that are difficult to attach by ordinary screwdrivers, easy to use 3Tight Connection: The functional head is equipped with lock and magnetic device to ensure that the holder does not fall off 4Spring Steel Connecting Rod: The extension holder is made of high quality spring steel material, has high hardness, bendable and durable 5Application: The flexible extension bar is suitable for all electric drills and wrenches, for car engine repair, etc.3 x FlexibleExtensionBarPay attention to safety protection when using.