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In 1909, Mr Brooks and his son filed patent N°7709 for improvements in adjustable spanners in the form of a rather clever and simple solution for those cyclists in need of box spanners in a variety of sizes.
Our new patent is an innovation upon the original, simplyfying the design and saving weight.
Spanner sizes from 1-19mm are possible by sliding the two pieces. The smaller piece is also a functional tyre lever.