Allen 56660G Metric Ball-Plus T-Thru Handle Set, 8-Piece From Allen, the original manufacturer of the hex key Dual material T-handle provides superior strength and ultimate comfort for extra torque and safety T-thru handle design has a long arm with ball end for access and a standard hex short arm for high torque Ball-Plus hex permits an entry angle up to 25 to work in hard-to-reach areas Heat treated, tempered alloy steel provides high strength and resistance to rotational distortion