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.