A key part of knitting is blocking, which involves refining the shape of your finished piece so it’s exactly the right size and every stitch looks nice and even. You can keep your pieces properly tensioned using T-pins, but blockers are a wonderful alternative. Featuring multiple pins attached to a handle, these allow you to pin down more of your work in less time while maintaining straighter, more defined edges. They’re also much harder to lose. Once you’ve experienced the convenience of blockers, also known as blocking combs, you’ll probably never go back to using just T-pins and a ruler. Most blockers are sold in sets and in two standard sizes: eight pins and four pins. We’ve rounded up our five favorites to help you make your choice.