Manufactured from heat treated and hardened Chrome Vanadium steel. Deep offset WallDrive® rings with a satin polished finish for resistance to corrosion. Supplied in storage/hanging pouch.8pc Offset Double End Ring Spanner Set• Manufactured from heat treated and hardened Chrome Vanadium steel.• Deep offset WallDrive® rings with a satin polished finish for resistance to corrosion.• Sizes: 6 x 7 8 x 9 10 x 11 12 x 13 14 x 15 16 x 17 18 x 19 20 x 22mm.• Supplied in storage pouch.• Lifetime guarantee*.• Model No. AK6327Model No: AK6327:Brand: Premier:Contents: 6 x 7PTDSEAAK6327