Drop-forged steel heads and fitted with fibreglass shafts. Manufactured in accordance with BS 876. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. Professional engineer's set. High quality drop-forged steel heads. Fitted with fibreglass shafts. Manufactured in accordance with BS 876. Contents: 340g(12oz), 450g(1lb), 680g(1.5lb). Lifetime guarantee*.