Original Calvin Klein K4U231WL / K604000035 Silicone Green 3mm watch strapThis watch strap from Calvin Klein fits on the watch model K4U231WL / K604000035. Please click on Alternatives to view all alternative straps. The lug width of this watch strap is 3mm, the widest part of the strap has a width of 10mm. This watch strap has a straight end. This means that this watch strap will also fit on other watch models (from the same brand but also other brands), provided that the width of the strap is the same and the original strap also has a straight end. Please read the Product features for more information about this strap.