Feature: Turn Square Head Hexagonal Shank Extension Bar Sleeve Beaded 1/4 3/8 1/2 Sleeve Wind Batch Electric Connection Switching Lever. Turns any power drill into a power nut driver Sturdy spring-loaded ball bearing holds sockets securely in place ,Sockets Snap-On Tightly and Won't Slip Off. Constructed of rust-resistant chrome vanadium steel for long lifetime handles the toughest jobs Hex shaft saves time changing out of Power Drill Saves time over traditional hand operated nut drivers. Kit Hardened & treated Chrome-Vanadium steel alloy for superior strength & durability Prevents Stripping during High Speed Drill Operation. Great to use:At home, in the workshop or warehouse for hobby, hardware, auto repair, and so much more. Specification: Material: Chrome vanadium steel CR-V Size: (All socket-drive adapter are 1/4" hex shank) 1/4 * 50mm length --- can be converted to 6.35mm square head 3/8 * 50mm length --- can be converted to 9.53mm square head 1/2 * 50mm length --- can be converted to 12.7mm square head Notes : 1.There could be some slight differences in the color tone of the pictures and the actual item. 2.Please allow 1-2mm differs due to manual measurement, thanks. 3.If there is any problem with the product, please contact me before you leave a comment, I will do my best to solve the problem for you.Thank you for your understanding. Note: 1. Please make sure the address is correct and we are not responsible for wrong or undeliverable addresses. 2. We fully understand it would be frustrated when the shipment takes longer than expected. As we promised, we will ship out the items within 7 day once payment clears, however, the shipping is controlled by the shipping company and we are just as anxious as you are. Low rating on shipping time would be unfair to us. Your understanding is highly appreciated. We hope our customers be happy when they received our items, so please only buy when the shipping time is acceptable for you. 3.Free shipping by ePacket to USA. 4. Our default shipping method is China Post air mail with tracking. Payment: 1. We accept Alipay only. 2. Simply click the "Pay Now" button at the top of your ended auction to submit a secure payment through checkout. 3. Final purchase price do not cover any applicable tax or duty that might be charged by customs .Buyers are responsible for such charges 4. If you have any problem on payment,please inform us. Return back and Feedback: 1.For any personal reasons (choose a wrong size / wrong color / doesn't fit ), you can simply email us to get the return mailing address and return the item(s) in its original condition. Return shipping charges will be the buyer's responsibility. We will not accept any items with odors (perfume, smoke, etc.) 2. If items are damaged, we must be contacted within 24 hours of receipt. 3. For other quality issues, we will refund immediately once we receive the photo of the item. 4. Item must be returned within 14 days after buyer received it. 5. Our Goal is to offer 5-Star Service if you do not feel that we deserve 5-Stars please contact us before leaving feedback. 6. Have questions on comments? We would be happy to hear from you! We are dedicated to our customers and feel you should receive the personal attention you deserve. We typically reply to e-mail within 24 hours during normal business hours. _x000D_