The BlueSpot Tools Long Arm Hexagon Key Set has been manufactured from chrome vanadium steel for increased durability. The keys have a black oxide coating to aid corrosion resistance. The extra length enables a greater amount of torque to be applied to the fastener. The tips are chamfered to enable access from a wider angle. Sizes: 1.27 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 8 10mmAdditional Information:• Type: Metric• Min. Size (mm): 1.27• Max. Size (mm): 10• Key Type: L-Shaped• End Type: Ball• No. Keys: 13