山下工業研究所（2ヶ国語）

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The top of Attack Driver is manganese ph-osphate treated to prevent chrome peeling off the head when it is struck.Original body shape allows st-ronger grip. It makes it easier to convert the striking power into twisting power.Special Heat treatment is applied on the parts of Attack Driver. Hardness of Striking head is slightly softer to prevent cracking. The cam part has higher hardness to imp-rove anti-wear.Strong spring is used to convert the striking power efficiently into twisting power.1 BLACK FINISHED HEAD2 BODY SHAPE1 3 HEAT TREATMENT FOR ANTI-CRACK3 SPRINGATTACK DRIVER®321Technical Features of Ko-ken Tools013

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