You love our standard model GRR-Ripper (GR-100), but you're ready for an upgrade. You'er ready to take your woodworking to the next level. With the Upgrade kit, you will turn your basic GRR-Ripper to the Advanced Model GRR-Ripper (GR-200). The Advanced Model GRR-Ripper is the ultimate woodshop companion; keeping you safe while giving you the accuracy to produce the exact cut you want. Are you ready for the next level?