The Brooks England Adjustable Spanner is a modern innovation inspired by the original 1909 patent filed by Mr. Brooks and his son. Designed to meet the needs of cyclists requiring box spanners in various sizes, this updated version simplifies the classic design while reducing weight. The spanner features an ingenious sliding mechanism that accommodates sizes from 1 to 19mm, allowing for quick adjustments and versatility. As a bonus, the smaller piece doubles as a functional tire lever, making it an essential multi-purpose tool for any cyclist.