MK-301, Gemking diamond lapidary saw blade: diameter – 6″ (152mm), width – .025, arbor – 5/8″, rim height 5mm, part number 166066. MK-301 Gemking (TM) lapidary blades have been redesigned with a greater diamond concentration and a higher carbon content steel core for improved tension memory. The solid diamond sintered kerf provides better cutting performance and improved coolant flow. The MK-301 provides superior cutting performances for hard materials such as agate, petrified wood or jade. MK-301 lapidary blades require a petroleum based or synthetic cutting oil as a cutting fluid/coolant. Water is not suitable to use with these blades and they should not be used dry under any circumstances. Manufactured by MK Diamond Products, Inc. We are proud to have been a dealer for MK Diamond Products for 25 years.