Comparison : Item # B4-20EA-18, CEMA B Self-Aligning Troughing Idlers - 4" Diameter
Item # B4-20EA-24, CEMA B Self-Aligning Troughing Idlers - 4" Diameter
Item # B4-20EA-30, CEMA B Self-Aligning Troughing Idlers - 4" Diameter
Item # B4-20EA-36, CEMA B Self-Aligning Troughing Idlers - 4" Diameter
Item # B4-20EA-42, CEMA B Self-Aligning Troughing Idlers - 4" Diameter