Comparison : Item # 4X5X4.0-12LH, 0.520/0.530 Inch (in) Width (w) Stick Gear Blanks Cutting Tool Insert
Item # 4X5X4.0-12RH, 0.520/0.530 Inch (in) Width (w) Stick Gear Blanks Cutting Tool Insert
Item # 6/775/4.25/12L, 0.795/0.805 Inch (in) Width (w) Stick Gear Blanks Cutting Tool Insert
Item # 6/775/4.25/12R, 0.795/0.805 Inch (in) Width (w) Stick Gear Blanks Cutting Tool Insert