采用高强度合金钢锻造工艺制成，经特殊热处理淬火。

It is made of high-strength carbon steel forging process and with heat treatment.

including:

包括：

250mm平凿一支

300mm平凿一支

350mm平凿一支

250mm尖凿一支

300mm尖凿一支

350mm尖凿一支

凿子直径18mm