Smooth-knitting addiClick Lace interchangeable needles are 5-inch click-in tips that will never come unscrewed while knitting. No tools are required to make a quick tip change; simply insert the cord deep into the tip, twist and release. Thanks to the Click’s revolutionary locking mechanism, the tips will remain secure until you choose to change them. addiClick Lace interchangeable needles are available in a variety of sizes from US 4 to US 11 (3.5 mm to 8.0 mm). One connection does it all! All addiClick system parts are fully interchangeable.