The Punching Dies usually refers to the removal of scrap plastic from the desired article. For example, in extrusion blow molding it is common to use punching dies to remove tails, molding flash (scrap plastic) and handle slugs from bottles or other molded containers. The Punch is usually, hydraulically driven to meet the Die. The location and alignment of the Die is critical, with the material to be punched in between. Punches are typically made of carbides or tool steel. Most presses are operated mechanically, but simple hand punches also are used. Punching Dies are made in various types.