This is the Topeak T Handle Duohex Set. When it comes to tools, you need durability and comfort. Topeak have produced these 6 professional quality, chrome vanadium steel hex wrenches. Each has one ball end for difficult to reach and blind locations. Ergo padded handle for increased grip and comfort while handling. Chrome vanadium is also used for large breaker bars, so you know these are tough hex wrenches. You can finally stop struggling with those small allen keys when you get these for your tool kit.