Features: brand new and high quality Each extension power drill features knurled bands which offer grip for turning loosened fasteners by hand. Each extension socket features high visibility markings for quick socket selection. This drive extension are great for working in hard-to-reach area, are for ideal for auto shops, garages and project. This set of drive tools can either be fully inserted for straight extension. These socket extensions add the for extra length you need to access and are perfect for loosening or tightening fasteners in confined spaces. This drive tool accessory set made of premium alloy steel, these extension bar set are steel tempered with proprietary heat treatment process to withstand more torque; coated . Specifications: Material: 45# Steel Type: 1/4, 3/8, 1/2 Length of 1/4 Set:14.5cm/5.71inches Length of 3/8 Set:20cm/7.87inches Length of 1/2 Set:25cm/9.84inches Package Includes: 1 Set Ratchet Wrench Extension Rods note: Due to manual measurement, there may be an error of 0-1mm.