A horseshoe ring sizer, also known as a horseshoe adjuster, is a small, curved insert that attaches to the inside of a ring. Shaped like a “U” or horseshoe, this flexible device can finely adjust the size of the ring without requiring any permanent adjustments. Unlike resizing with cutting or stretching the ring, a horseshoe sizer simply clips inside the band, filling the gap between the finger and the ring band for a snugger fit. Ideal for temporary adjustments, a horseshoe ring sizer is commonly used by those with fluctuating finger sizes or those who prefer a removable option.