This Worm Drive Clamp is a 300 Series Stainless Steel Construction Clamp Band, housing and screw are 410 series stainless steel. Screw is 5/16" slotted hex head.
ABA Original SMS - W5 (AISI 316) - 12 mm hose clamp / Worm Drive Clip | IQ-Parts-Shop
Stainless steel Hose clamp 70 - 90 mm Worm drive clip W5/AISA316 - AB Marine service