Comparison : Item # 0403CSBDX, 0403CSBDX - 4-40 Button Head Cap Screws
Item # 0404CSBDX, 0404CSBDX - 4-40 Button Head Cap Screws
Item # 0406CSBDX, 0406CSBDX - 4-40 Button Head Cap Screws
Item # 0408CSBDX, 0408CSBDX - 4-40 Button Head Cap Screws
Item # 0412CSBDX, 0412CSBDX - 4-40 Button Head Cap Screws