7 Piece, External Torx Socket, For External Torx Bolts: E6, E7, E8, E10, E12, E14 & E16, The 3 Smaller Sizes Are 1/4" Drive, The 4 Larger Sizes Are 3/8" Drive, Sockets Are Made Of Special Heat Treated Alloy Steel, Stored In A Convenient Vinyl Holder.