BREEZE AERO-SEAL 300 SERIES HOSE CLAMPS – The original stainless steel worm-drive clamp. Heavy-duty four piece QUADRA-LOCK construction enables far more tightening torque to be delivered to the band perforations. Used for aircraft and heavy-duty industrial applications. The 300 series is highly corrosion resistant for marine and underground use. All 300 series hose clamps are stainless steel. Band width is 9/16″. Product is sold by the individual hose clamp.