Grid mats with lines to align the sides of your project and block squarely for pro finish. Create more configurations to fit larger-sized projects such as triangular shawls, blankets, lace, long scarf or use them individually for your hand knit socks. This set is a must-have in your craft bag for knitting and/or crocheting supplies. Stainless-steel T-pins are sharp, rustproof, and strong for steam-blocking your projects to perfection. The KnitIQ Blocking Mats are heat-resistant, allowing you to safely steam blocked pieces without any detrimental effects on the foam or grid lines. Steam with confidence.