Comparison : Item # A004401C, A004401C - 4-40 Floating Nuts
Item # A004401D, A004401D - 4-40 Floating Nuts
Item # A004402C, A004402C - 4-40 Floating Nuts
Item # A004402D, A004402D - 4-40 Floating Nuts
Item # A006321C, A006321C - 6-32 Floating Nuts