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The Faithfull Box Type Immersion Heater Spanner provides a firm non-slip grip on immersion heater elements. The deep box design allows easy access to heaters that are surrounded by insulation or recessed. Supplied complete with a tommy bar to help provide added leverage when removing over tight elements. Manufactured from high-quality steel.Additional Information:• Spanner Type: Box• Size (mm): 86• Size (in): 3.3/8