Specifications: Fit Strap Width: 21mm / 0.83-inch; Total Size: 25.5 x 5.5mm / 1 x 0.22-inch(L*W); 4 x Watch Band Strap Loops Compatible: Watch band loop for 21mm width strap (Watch or Wristband is NOT included). Measure width from side to side where the buckle attaches, notice that many watch bands have a taper and are narrower at the end where the buckle attaches than at the end where the watch attaches. Watch Band Loop: Made of great pu leather, corrosion resistance, sturdy material for stable connection with both sides of the watch band. Design: These fastener rings can be well inserted into the watch strap and will not easily fall off, offering protection to your device. Notice: To extend the service life of the loop keeper, please keep it away from water. Don't wear it into swimming.