Bobrick B-204-1 Shower Curtain Hooks 

Shower curtain hooks shall be 0.09 in. (2mm) diameter, type-304 stainless steel. Hooks shall be usable with 1 in. and 1-1/4 in. (25 and 32mm) diameter shower curtain rods. Shower curtain hooks can be used with 1 in. and 1-1/4 in. (25 and 32mm) diameter shower curtain rods.