The Astro Pneumatic 1036 6pc 3-in-1 Hex Key Wrench Set is a multi-function Internal/External/Ball Hex Key Wrench Set.. It comes equipped with a slide sleeve to switch from the Internal, to External Function and has L-Key handles made with S2 steel, providing strength and durability. This item includes the following popular sizes: External Hex: 5, 6, 7, 8, 9, 10Internal Hex: 5, 6, 7, 8, 9, 10Ball End Hex: 5, 6, 7, 8, 9, 10The Astro Pneumatic 6pc 3-in-1 Hex Key Wrench Set is a multi-function Internal/External/Ball Hex Key Wrench Set.. It comes equipped with a slide sleeve to switch from the Internal, to External Function and has L-Key handles made with S2 steel, providing strength and durability. This item includes the following popular sizes: External Hex: 5, 6, 7, 8, 9, 10Internal Hex: 5, 6, 7, 8, 9, 10Ball End Hex: 5, 6, 7, 8, 9, 10.