- SPI Standard
- Choose from 3 diameters
- Seven material designations
- Blank insert for custom engraving
- Material - 420 Stainless Steel
- 50-55 HRC
- Unit of measure - millimeters
PCS Company offers Recycle Inserts that are engraved with SPI standards. Choose from 3 diameters and 7 material designations. There is a blank insert option with arrow only for custom engraving. Made of 420 stainless steel with hardness of 50-55 HRC.