Stahlwille Combination Spanners Imperial AF 10 Piece Set are made from chrome alloy steel, chrome plated. Contents: 1/4, 5/16, 11/32, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16 and 3/4 AF. Stahlwille set of 10 Combination Spanners. AF imperial, with 15° offset ring end. The spanners are drop forged from high-grade special steels and chrome plated. They have been optimally hardened in continuous furnaces with no scale build-up or skin decarburisation and gently quenched in oil. The spanners are extremeley strong yet lightweight due to Stahlwille\'s \'double-T profile\'. Stahlwille\'s unique plating method prevents the problem of chrome flaking. The ring end of the combination spanners are equipped with an Anti-Slip Drive profile. This permits high transmission of forces to the flats of the nuts and bolts without damaging them. This 10 piece set contains the following sizes: 1/4, 5/16, 11/32, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16 and 3/4in AF. MADE IN GERMANY.