• 7409MR/S7 3/8" square drive socket drivers (3, 4, 5, 6, 7, 8 and 10 mm) of ref. 7409M on rail-187 • Knurled shank for finger turning of free running fasteners • Not suitable for use with power tools • Highly polished finish • High-performance alloy steel • Supplied on zinc coated metal rail with holes for wall mounting • Standards: ISO 1174 and DIN 3120