Watch straps and buckles (both pin and folding) are the nearly ideal way to fit your watch to your wrist, but they have an inherent drawback: the standard holes in the strap are 8 mm apart, so unless you are very lucky you have to select a hole that either makes the strap too tight or too loose. The perfect answer is either paying for a custom strap and hoping that your wrist size doesn’t change or a Roland Iten RWC09 adjustable buckle.