The BlueSpot Tools Extra Long Ring Spanner Set is manufactured from heat-treated chrome vanadium steel that has been nickel chrome plated for increased durability. With a fully polished mirror finish. Comes with a useful tool roll for quick and convenient storage. Sizes: 8 x 10mm, 11 x 13mm, 14 x 15mm, 16 x 17mm, 18 x 19mm, 20 x 21mm, 22 x 24mm Ref: UTTK1396