Microjig Grr-Rip Block Smart Hook Pushblock w/Matchfit Dovetail Clamps Auto-retracting heel technology hooks the tail-end of your board Proprietary Green GRR-RIP for extreme hold 90-degree flipguide for vertical footing on bandsaws and router tables Ergonomic handle exerts directional pressure against the fence Optional mounts for Deflector/Connector shield plate for additional protection against chip debris