Wera tool-check plus imperial 1/4" drive - Metric sizesBit Ratchet Kit with Bits, Sockets and Holder Bit ratchet kit with bits, sockets and holder with outwards tilting bit section for easy access. 39 piece 1 4" drive kit with metric sizes. Includes a Zyklop Mini 1 bit ratchet and a bit holding screwdriver handle. These take 1 4" hex bits, a special adapter that allows the use of regular 1 4" drive sockets of which there are 7 included, ranging from 5. 5mm to 13mm. Sockets are chrome vanadium with a