The MK-301 Gemking 8" diamond lapidary saw blade statistics: diameter 8" (203mm), width - .040, arbor - 5/8", rim height - 5mm, part 166067.  The MK-301 Gemking has been redesigned and provides superior cutting performance for hard materials such as agate, petrified wood or jade. The MK-301 requires a petroleum based or synthetic cutting oil as a cutting fluid/coolant.  Water is not suitable, and never use the blade dry. Manufactured by MK Diamond Products.  A discount will be given at the Shopping Cart.