Rainbow Knit Blockers - Comb For Knit BlockingBlockers for tensioning of knitted or crocheted projects in hollow pattern. These blockers are an innovative solution that allows you to easily and quickly block your project. Use: wash or moisten your knitting or crochet project. Then stretch the project onto a substrate that can withstand needles. We recommend these KnitPro mats for lace blocking. Attach your blockers along the edge of your project so the project keeps the shape as it dries. The