Various Size: Metric：10 mm, 11 mm, 13 mm, 14 mm, 15 mm, 16 mm, 18 mm, 19 mm, 22 mm. Standard：3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, 11/16 inch, 3/4 inch, 7/8 inch adding convenient reach in tight space Daily Helper: Suited for 3/8 ” ratchet handle and extension bar. Connecting them with the crowfoot wrenches to tackle your daily issues, giving you more options when you are trying to get fasteners in tight spaces