The 4-40x3/8" black pan head machine screw is a very tiny piece of scooter hardware that does a multiplicity of jobs. It is most commonly found fastening the battery boxes, shrouds, and tiller panels together on some of the older Pride Mobility scooters. Some of the scooters that use this handy little machine screw are the Pride Dynamo, Revo, Sidekick, and Sundancer.