General description Box spanners are thin, long tools designed to tighten or loosen bolts and nuts in narrow spaces. They are commonly used in plumbing maintenance and automotive repair. Made from bright plated steel, these tubular box spanners can accommodate a tommy bar for added leverage. The set includes multiple sizes suitable for various applications, including a spark plug spanner. Technical specifications Set includes 8 pieces with sizes: 9 mm, 10 mm, 11 mm, 12 mm, 14 mm, 17 mm, 21 mm, and a 14 mm spark plug spanner. Lengths range from 50 mm (2 inches) to 82 mm (3.1/4 inches). Size range: 8-22 mm. Double-ended spanners for most sizes, with single-ended options for some. Compatibility and accessories Designed to fit bolts and nuts within the specified sizes. Compatible with a tommy bar for increased torque. Installation No installation required; tools are ready to use straight from the set. Usage Use the appropriate size spanner to tighten or loosen fasteners in tight or