ACDelco Idler Pulley - 12669569 Part #: 12669569 Line: ACD ACDelco Idler Pulley 1 Year Limited Warranty Contact Surface: Smooth Material: Steel Pulley Width (mm): 34mm Pulley Width (in): 1-3/8 Inch Pulley Outside Diameter (in): 3-9/16 Inch Number Of Mounting Holes: 1 Number Of Pulley Grooves: 0 Pulley Inside Diameter (in): 0.437 Inch Pulley Inside Diameter (mm): 10mm Show More Show Less