The CHP-21G INV is the largest machine in the range. It is suitable for heavy gauge materials and ready to work at upside down position. Its robust construction will give many years of service. It is easy to use and trans......The CHP-21G INV is the largest machine in the range. It is suitable for heavy gauge materials and ready to work at upside down position. Its robust construction will give many years of service. It is easy to use and transport as the smaller models.