Multi lock sockets are a new patented design that fit six different fastener configurations: Square, Torx-r, 6 Point and 12 Point, SAE and Metric Hex, Spline and Ribe. Set Contains (Supplied On Two Socket Rails): 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 26mm, 27mm, 28mm, 30mm, 32mm Multi-Lock Sockets 1/2" Drive. Multi-Lock Sockets (Available Separately): Item No. Size Drive Length M5410L 10mm 1/2" Square 76mm M5411L 11mm 1/2" Square 76mm M5412L 12mm 1/2" Square 76mm M5413L 13mm 1/2" Square 76mm M5414L 14mm 1/2" Square 76mm M5415L 15mm 1/2" Square 76mm M5416L 16mm 1/2" Square 76mm M5417L 17mm 1/2" Square 76mm M5418L 18mm 1/2" Square 76mm M5419L 19mm 1/2" Square 76mm M5420L 20mm 1/2" Square 76mm M5421L 21mm 1/2" Square 76mm M5422L 22mm 1/2" Square 76mm M5423L 23mm 1/2" Square 76mm M5424L 24mm 1/2" Square 76mm M5426L 26mm 1/2" Square 76mm M5427L 27mm 1/2" Square 76mm M5428L 28mm 1/2" Square 76mm M5430L 30mm 1/2" Square 76mm M5432L 32mm 1/2" Square 76mm Sizes That Multi-lock Sockets Fit For All The Different Configurations: MM (12 Point) SAE (6 Point) Torx (Star) Spline Square WW (12 Point) E-Torx (Female) (Star) 10mm - T55 - - - - 11mm 7/16" T60 M14 3/8" 3/16" E16 12mm - - - - - - 13mm 1/2" T70 M16 7/16" 1/4" E18 14mm 9/16" - M18 - - - 15mm - T80 - 1/2" 5/16" E20 16mm 5/8" - - - - - 17mm - T90 - - - E22 18mm - - - 5/8" 3/8" - 19mm 3/4" T100 - - - E24 20mm - - - - - - 21mm - - - - 7/16" - 22mm 7/8" - - 3/4" - - 23mm - - - - - - 24mm 15/16" - - - 1/2" - 26mm - - - - 9/16" - 27mm 1.1/16" - - - - - 28mm - - - - 5/8" - 30mm 1.3/16" - - 1" 11/16" - 32mm 1.1/4" - - - - -