Stahlwille Series 10 Double Open Ended Spanner. Metric, made from drop forged from high-grade special Chrome Alloy Steels and Chrome Plated. Manufactured to DIN 3110, ISO 10102. The Spanner has been optimally hardened in continuous furnaces with no scale build-up or skin decarburisation and has been gentlly quenched in oil. It is extremeley strong yet lightweight due to Stahlwille’s ‘double-T profile’. Stahlwille’s unique plating method prevents the problem of chrome flaking. With 15° offset. Made n Germany.