Automatic Slack Adjuster Release Tool for air systems on heavy-duty trucks, long-haul trucks, and trailers; Brake adjustment tool improves brake service The 5/16 inch double square ratcheting wrench provides reversible ratcheting action with an angled head for easier operation 7/16 inch Wrench is for brake adjustment on heavy-duty trucks equipped with slack adjusters 9/16 inch Wrench is for brake service and slack adjuster installation on heavy-duty trucks equipped with slack adjusters. Fork-end designed tool to fit securely under pull pawl, allowing hands-free operation Color: Orange Material: Metal Package Contents: 4x Slack Adjuster Tool Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.