1-1/4" ID x 1-7/8" OD

This nozzle holder is for hoses with a 1 1/4” inner diameter (ID, which goes inside the nozzle) and a 1 7/8” outer diameter (OD, which goes over the outside diameter of the blast hose). 

1-1/4" ID x 1-7/8" OD

This nozzle holder is for hoses with a 1 1/4” inner diameter (ID, which goes inside the nozzle) and a 1 7/8” outer diameter (OD, which goes over the outside diameter of the blast hose).