These hose clamps are to ensure a tight seal between the hose and the barb, preventing the working fluid from escaping. Hose clamps are typically limited to moderate pressures. They are used as a permanent version of duct tape wherever a tightening band around something would be useful. Details: Silver 2.5" x 0.5" x 2.25" Tightens with the flathead screwdriver Durable stainless steel Use with hoses or pipes Fits vacuums and filters hoses 1.25" to 1.5" diameter Screws are included Stainless steel