Micro Jig's Gravity Heel fits all GRR-Ripper models. It is fully adjustable and features auto-retracting technology to provide commanding pushing power. The heel hooks the tail end of your workpiece and automatically retracts if the pushblock is placed mid-board. The Gravity Heel helps you work more safely by providing extra leverage to help push through your cuts and prevent blow out. Kit includes five (5) heels, two (2) heel spacers, and mounting hardware. Adjustable up to 1".