Poulan Thumbscrew part# 024482 supersedes to part# 530-024482. This thumb screw has 10-24 pitch thread, is 3/4" long, and was used to hold the carburator cover on 3400 model chainsaws. Poulan lists this part as being "No Longer Available". Please refer to an owners manual or a parts breakdown before ordering, to assure that this part will work with your particular model.