Wera 8790 FA Shallow Sockets are designed to work in conjunction with the 8005 Zyklop Mini 2 ratchet for a combination that will allow fasteners to be driven in very confined spaces. The socket is either “housed” inside the 8005 ratchet or using it’s 1/4” square drive, can be used on conventional ratchets. 1/4” drive, 4mm.