Comparison : Item # 7521-0187, Delrin® 150 Natural Round Bar
Item # 7521-0250, Delrin® 150 Natural Round Bar
Item # 7521-0312, Delrin® 150 Natural Round Bar
Item # 7521-0375, Delrin® 150 Natural Round Bar
Item # 7521-0437, Delrin® 150 Natural Round Bar