Combo set contains set 13213 and 13609 and has a total of 22 pieces. 13213 is an inch set from .050 to 3/8 with 13 piecs. 13609 is a metric set containing 1..5 through 6mm in 9 pieces. Eklind keys are designed with the ball end on the long arm which provides 30 degrees of rotation at up to a 35 degree angle.