Very compact 21-piece tool set. One Kraftform 815/1 handle, suitable for mounting bits with 1/4" external hexagon drive, one 8011 Zyklop Mini 4 bit ratchet (1/4"), also suitable for 1/4" sockets using the included 870/1 adapter (1/4" external hexagon to 1/4" external square head), one magnetic 899/4/1 bit holder for screwdriver machines, 9 BiTorsion bits (BTZ) with 1/4" external hexagon drive for Phillips-head screws, TORX®, slotted and square head, 4 tough bits (Z) for hexagonal socket (imperial sizes), 4 Zyklop 8790 HMA sockets (imperial sizes), 1/4". In the compact Tool-Check Modular 1. Tools can be connected to other components of the Tool-Check Modular system using the rigid Tool-Check Modular adapter 9549 or the flexible Tool-Check Modular hinge 9550.