This Ginson kitchen sink drain strainer measures 4.5"(11.5cm) wide. The middle opening measures 7cm wide and 1.5" deep.  The kitchen sink drain strainer is stainless steel and is great to prevent and trap hair and other things from falling into the kitchen sink drain and clogging it. Water pass through but not the debris. Stop clogs now. These simple devices can save you hundreds of dollars in plumbing bills!