Sachi Perfect 4" X 5/8" Arbor Super Thin Spring Steel Diamond Lapidary Blade 4" New diamond lapidary spring steel saw blade THIS WILL FIT A 5/8" ARBOR or 1/2" with a bushing Perfect for softer high value rocks like tuquoise, gaspeite, opals. Paper thin, 0.008" where the diamond is and 0.005" on the plate.