No-Slip design in forged cro-moly steel grips flats of fasteners not the corners . 1/2" drive deep length 6 point impact sockets and comes in a blow molded case. Includes: Fractional sizes- 7/16" 1/2" 9/16" 5/8" 11/16" 3/4" 13/16" 7/8" 15/16" 1" 1-1/16" 1-1/8" and 1-1/4". Metric sizes- 10 11 12 13 14 15 16 17 18 19 21 22 26 and 27mm. Flip Sockets - 3/4"x13/16" and 19mmx21mm.