Lug width is expressed in millimeters (mm). The first number is the width of you watch lug, and the second number is the width of the strap at buckle area. You might be confused, what is straight and tapered. Straight is when the lug width and buckle width is the same (example : 24/24) Tapered is when the straps get tapered from lug width to buckle width (example : 24/22) If you’re not sure about the sizing, please let us know. Sometimes, the lug width of your watch is not that simple to measure, so we will need to know the type of your watch and the brands also. We will help you find the sizing and make the straps fit your watch perfectly.