Manufactured from heat treated and hardened Chrome Vanadium steel with a fully polished finish.Keys range in length from 90.5 to 231mm.Contents: 1/16", 5/64", 3/32", 1/8", 5/32", 3/16", 1/4", 5/16", 3/8".Anti-slip coating for comfort and control. Supplied in easy-access case for safe storage and quick key selection.Lifetime guarantee*.Model No. AK7175SEALEY PREMIER - One of a comprehensive range of Premier Hand Tools, suitable for daily professional use.HEAT TREATED CHROME VANADIUM STEEL – Hardened for strength and durability. RANGE OF KEY LENGTH AND SIZES – Keys range in length from 90.5 to 231mm and in size from 1/16" to 3/8".ANTI-SLIP COATING – Gives greater control and comfort in application. BALL-END – Allows key to drive fixing at up to 30°.9PC SET – Contents: 1/16", 5/64", 3/32", 1/8", 5/32", 3/16", 1/4", 5/16", 3/8".EXTRA-LONG- For increased access in space limited applications. SUPPLIED IN STORAGE CASE – For easy access and quick key selection. LIFETIME GUARANTEE*.