4 bars Material:SS201,SS301,SS304 Spec.:8",10",12",14",16",18",24",36" Bar thickness:2.0,2.5,3.0(mm) Square slot:width 18mm 1. As one friction stay with 18mm square slot, non-handed and light-duty, FB180 is suitable for side-hung outward opening aluminum window or PVC steel window.2. Steel/PVC composite slider bring more strengthen, durable and smooth operation. Brass slider is also available.3. ...