ChiaoGoo's swivel adapters add a rotating join to your TWIST red and X-Flex blue cables. Each adapter screws in between a needle tip and the cable, so the cable can turn freely at the join while the tip and cable stay firmly connected. As you knit, the needle tends to turn slightly in your hand, and a fixed join resists that motion. It shows up as cable twist and as a needle that fights your grip. The swivel lets that motion release at the cable instead, so the cable stays untwisted and your hand can stay relaxed. The effect is most noticeable with QUADS square tips, where even a small turn rolls a flat side onto a corner, but it helps with round tips too. Choosing the Right Size Pick the join size that matches your needle tips. Small [S] adapters fit: 2-inch and 3-inch tips: US 4 (3.5 mm) through US 8 (5 mm) 4-inch and 5-inch tips: US 2 (2.75 mm) through US 8 (5 mm) Large [L] adapters fit: 3-inch tips: US 9 (5.5 mm) through US 11 (8 mm) 4-inch and 5-inch tips: US 9 (5.5 mm) through US 15 (10 mm) Mini cables, used with the smallest tips, do not have a swivel adapter available. Getting a Secure Join Each adapter adds an extra join, so it works best when every connection is snug. The adapter has a small hole in it. Spin the adapter until you can see through the hole, then slip the ChiaoGoo tightening key or a T-pin through it to hold the swivel still while you screw the adapter onto the cable and the tip. Tighten both the cable side and the adapter side, then remove the key. A firm join keeps the adapter from loosening or catching the yarn as you knit. The short how-to video in this listing walks through it. Details Two adapters per package, enough to swivel both ends of one cable Surgical-grade, hypoallergenic stainless steel with a smooth, snag-free finish Works with TWIST red and X-Flex blue cables (SPIN and SWIV360 cables already swivel and do not need an adapter) Compatible with any ChiaoGoo interchangeable tips that use the matching [S] or [L] join, including TWIST, SPIN, Forté, bamboo, and QUADS For use with ChiaoGoo brand products only For the short Blue Shorties cables, a single adapter on one end adds swivel freedom while keeping the extra length to a minimum.