【What you will get】there are 6 pieces of magnetic screwdriver bit holders in the package, sufficient quantity and different sizes to meet your daily use and replacement needs 【Quality material】the drill bit extension set is made of quality chromium-vanadium steel, stable and strong, can stand high pressure 【Magnetic design】designed with locking mechanism and built-in magnetic, this bar socket chuck adapter is easy to eject the batch head automatically to ensure release in a short time 【Dimension detail】our hex shank power drill bits tools include 3 different lengths, namely, 2 inch/ 60 mm, 4 inch/ 100 mm and 6 inch/ 150 mm, each size come with 2 pieces 【Wide applications】our drill bit extensions are suitable for nut, batch head, pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and screwdriver head conversion uses;