Die Spring 5 Pack 18mm OD 30mm Long Spiral Stamping Medium Load Die Springs Red

Description: 1. Rectangular section closed-end design. Die springs are primarily used in die machinery equipment for plastic injection 3D printer electric part. 2. The loading grade of die springs in various colors (from lightest load to extra heavy load): yellow blue red green brown. 3. Made of 65Mn material the surface is red painted not easy to rust more durable.