Lang Tools 7578 7/16" Automatic Slack Adjuster Wrench, 7/16" Made in the USA, Lang Tools (7578) 7/16" Automatic Slack Adjuster Wrench is for brake adjustment on heavy-duty trucks equipped with Haldex slack adjusters. This slack adjuster wrench has an extra-long handle, which provides comfort while overcoming the anti-reverse mechanism. For brake adjustment on heavy-duty trucks with Haldex slack adjusters Extra-long handle provides comfort while overcoming the anti-reverse mechanism Made in the USA