Replacement clamps for GRIPtight frames keep fabric layers secure across the bar while you stitch. The 20 cm length snaps over PVC rails and adjusts by rotating outward for quick loading and tensioning. Use as spares or to supplement your set when working with thicker quilts, borders or backing extensions; helps maintain even surface tension and reduces puckering during hand quilting. Designed for accurate setup and repeatable results; ideal for classes, guild kits and retail demo bars.