This is an unopened, unused item, but the outer packaging is dirty. Please refrain from purchasing if you are concerned. * Calipers are not included. Description: By inserting this into a ratchet handle, tightening can be done quickly. For tightening and loosening hexagon socket head bolts and screws. Drive size (mm): 6.35 Overall length (mm): 25 Hex size (mm): 8 Bit length (mm): 9