Rolson Tools Metric & Imperial Hex Key Set, 30 Pieces (15 x Imperial, 15 x Metric). Quality precision hexagonal keys. Standard arm metric & long arm imperial. Long arm: 0.028", 0.035", 0.05", 1/116", 5/64", 3/32", 7/64". Long arm 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" 3/8".