This is a chain screwdriver head, made of durable steel material, not easy to damage, and durable. Fine workmanship, , easy to install and easy to use. The nails are delivered accurately and not easy to fall off, which can meet your needs and to your work.Features-Color: Black.-Material: Steel.-Size: About 24.00X7.00X5.20cm/9.43X2.75X2.04inch.-Mainly made of steel material, strong and durable, .-Easy to adjust, easy to install, efficient and practical, it can meet your needs well.-The design is reasonable, small and light, easy to carry and use, and can provide you with convenience.-This is a very efficient and practical woodworking tool that will effectively help you improve your work efficiency.-It is made with excellent craftsmanship, has a simple application method and durable quality.Package list: 1 set x staple device