Professional tool for commercial or occasional use. Manufactured from chrome vanadium steel for strength and durability. Double ended ratchet ring spanner design. 72 tooth (5 degree) ratchet heads so ideal for access and use in tight awkward hard to reach areas. Reversible all you need to do is turn the spanner over for tightening or undoing. 6pc set and 12 different size spanners. Metric sizes. Set Includes; Sizes 8mm x 9mm double ended spanner total length 147mm 10mm x 11mm double ended spanner total length 165mm 12mm x 13mm double ended spanner total length 185mm 14mm x 15mm double ended spanner total length 201mm 16mm x 17mm double ended spanner total length 220mm 18mm x 19mm double ended spanner total length 236mm Complete in canvas tool roll for easy storage and transportation