The side of this barrel is injection molded, which is molded once with the barrel body and is molded by a set of molds. When making a mold, the punch and the die can be processed into a flanging shape. The hole of the handle is completed by side core pulling.

Stainless steel is a metal product, which is processed by flanging or curling die alone. Generally speaking, it is divided into three steps: 1, stretching and forming. 2, trimming and punching. 3, plastic flanging.