Comparison : Item # V30016-12-AC, Single Beveled Dish Blade with Keyway 30 Degree
Item # V30020-12-BC, Double Beveled Dish Blade with Keyway 70/30 Degree
Item # V30043-25-BX, Class II Dish Blade
Item # V30405-12-AGC, Single Beveled Dish Blade with Bayonette Bore 30 Degree