The 49-66-6735 Milwaukee 3/8'' Drive Socket Rail uses interchangeable socket rail clips for rail customizations based on your socket storage needs. Our Socket Rails work with all chrome and impact sockets and are offered in 1/4'', 3/8'', and 1/2'' drive. Removable end caps make the rail adjustments easy. The Milwaukee® Rail Clip 10 Packs are available in 1/4'' drive (49-66-6739), 3/8'' drive (49-66-6740), and 1/2'' drive (49-66-6741).