Available in different sizes:
51001 - 1" OD X 5/8" Projection
51002 - 1-1/4" OD X 7/8" Projection
51003 - 1-1/2" OD X 3/4" Projection
51004 - 1-3/4" OD X 1" Projection
51005 - 2" OD X 1-1/8" Projection