The Sheet Bend is commonly used to tie two ropes of unequal thickness together. The thicker rope of the two is used to form a bight, and the thinner rope is passed up through the bight, around the back of the bight, and then tucked under itself.

The knot should be tied with both ends coming off the same side of the Bend, as illustrated here. However it can be accidentally tied with the ends coming off opposite sides of the Bend, when it is known as the left handed sheet bend. The Left Handed Sheet Bend is to be avoided as it is less secure