Features:*Material: chrome vanadium steel*Color: silver*Size:1/4" square hole to 1/4"(6.3mm)*It is used for screwdriver bit, socket adapter,step drill,chamfer converter*6.3mm series screwdriver head or*It is forged with high-quality chrome vanadium steel 50BV30, strong and durable.*The mirror finish is polished and chrome-plated, which has strong corrosion resistance and is not easy to rust.*Quantity: 4pcsPackage Contents:4 x 1/4" square hole to 1/4" hex converterNotes:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.