SWAP IN SECONDS: Quick release spring bars allow you to swap bands in seconds to compliment your wardrobe or mix and match with BARTON's other Leather, Canvas and Silicone quick release watch bands to take your timepiece from the gym to the workplace. Simply slide quick release knob with finger as shown in diagram. Measure watch lug where 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 or spring bars will not fit correctly. You can also find the specifications for most watches by searching online. TWO LENGTHS INCLUDED: Each band comes standard with different two lengths of the ‘long side’ of the strap (the side with the holes), assuring a perfect fit for nearly any wrist. Fits wrists 5" to 8" in circumference, but watch geometry may also impact fit. LOCKING FEATURE and OTHER ATTRIBUTES: proprietary locking feature assures that the free end of the strap stays securely in place. Quick release spring bars, durable silicone, solid tang 316L stainless steel buckle, scent free and dust free, 2mm taper from watch head to buckle.