Despite questions about this knot's security, it does present some advantages for use in rappels. Because the knot is offset from the "axis of tension", it can translate more easily over rough surfaces and 90 degree edges than other knots; and it is quickly tied and readily untied. Since a stuck rope on a descent also represents a serious hazard to climbers, these advantages, along with ease of tying, have led to its popularity. It is recommended by some sources with the caveats that the tails be of sufficient minimum length (never less than 200mm), the knot be diligently dressed and fully tightened by pulling individually on all four rope segments, and then subjected only to moderate rappelling loads.