These Advance Adapters 6-bolt to 4-bolt tailshaft adapters are designed to adapt the late model 4L60E hex bolt pattern to any 700R adapter that Advance Adapters manufactures. The adapters' length is 1.500 in. when bolted on to the 4L60E. They are manufactured from 356 T-6 heat-treated aluminum alloy and include an adapter housing, a GM VSS sensor, a clamp-on reluctor ring, fastening hardware, and instructions.