This clamp is our throat hoop type, one way for 1/2" S, 1/2'', 7/8'', 1-1/4'' or 1-5/8'',  the metal parts are made of stainless steel 304. Also the hose clamp could be supplied according to your requirement, such as 1''-2'', 2''-3'', 3''-4'', 4''-5'', 5''-6'', the hose clamp could be supplier separately.