Q. Is tghis a metric or imperial set as I am looking for a 1/4" allen key drive bit.
A. Hi Neil. The following parts are supplied in the tool kit: 1/2"Sq Drive Impact Driver, Bits; Hex - 4, 5, 6, 8mm, Slotted - 5, 6, 8, 10, 11mm, Phillips - #1, #2, #3, #4, Adaptor; 1/2"Sq Drive x 8mm Hex.