This GReddy dual-bead boost clamp is specified as stainless steel with a 39–56mm (#28) size range, suitable for securing boost hoses, intercooler piping or intake connections. The dual-bead clamp designation and stainless material are given in the product description, and the explicit size range helps ensure correct selection for pipe or hose outer diameters within that band.
GReddy DUAL BEAD BOOST CLAMP 39-56MM #28 STAINLESS