This precision made tool is designed to insert into the wiper bezel stem nut used for assembly or disassembly without damaging the nut. This design allows for the use of a 7/8 or 22mm wrench if needed. CNC machined from solid billet aluminum with a black anodized finish. Caution! Do not over-tighten. This may damage the tool and the bezel. Use firm pressure pushing the tool into the bezel while loosening or tightening with wrench. Hand tightening in most cases should be sufficient.