THIS SET COMES WITHOUT A SIZE 6 BIT. Has in 1/4" drive: 7mm, 8mm. Has in 3/8" drive: 10mm, 12mm, 14mm, 16mm. These are metric,  external Torx impact sockets. Made for turning torx bolts. If you don't need the size 6 socket,  this set will be fine. No initials or markings from previous owners. Shows little signs of use. Good enough for work.