Manufactured from chrome vanadium steel for strength and durability Zinc coated for rust and corrosion resistance. Set includes 8 metric double ended box spanners and a tommy bar. Double ended spanner so one spanner has 2 different sizes Set Includes; Sizes: 1 x box spanner 8mm x 9mm total length 115mm 1 x box spanner 10mm x 11mm total length 127mm 1 x box spanner 12mm x 13mm total length 140mm 1 x box spanner 14mm x 15mm total length 142mm 1 x box spanner 16mm x 17mm total length 149mm 1 x box spanner 18mm x 19mm total length 163mm 1 x tommy bar to suit all different size box spanners total length 172mm