CHANGE IN SECONDS The quick release spring bars allow you to change the bands in seconds to complement your wardrobe or match with other Barton watch straps made of leather, canvas and quick release silicone to take your watch from the gym to the workplace. Simply slide the quick release button with finger as shown on the diagram. SELECT THE RIGHT WIDTH Compatible with any traditional or smart watch that uses 18mm, 19mm, 20mm, 21mm, 22mm, 23mm or 24mm spring bars. Measure the lug of the watch where the band and spring bar meet the watch casing. It is important that your watch's lug width is the exact width of the band you select otherwise spring bars will not fit correctly. You can also find the specifications of most watches by searching online. TWO LENGTHS INCLUDED Each bracelet comes standard with two different lengths of the "long side" of the strap (the side with the holes), ensuring a perfect fit for almost any wrist. Fits wrists from 5" to 8" circumference, but watch geometry can also impact fit. Lock Function and Other Attributes Barton's exclusive locking feature ensures the free end of the strap stays securely in place. Quick release spring bars, durable silicone, 316L stainless steel buckle, fragrance and dust free, 2mm cone from head to buckle.