This drive tool accessory set premium alloy steel, these extension set are steel tempered with proprietary heat treatment process to withstand more torque; coated Each extension power drill features knurled bands which grip for turning loosened fasteners by hand Each extension socket features high visibility markings for socket selection These socket extensions add the for extra length you need to access and are perfect for loosening or tightening fasteners in confined spaces This set of drive tools can either be fully inserted for straight extension This drive extension are great for working in hard-to-reach area, are for ideal for auto shops, garages and project, Manufacturer: Mekalero