12" SINTERED diamond lapidary rock slab trim blade Arbor 25 mm bushings 1/2" 5/8" 3/4" Code WYP-300-25mm Diameter : 12" (300mm) Thickness: 0.047" (1.2mm) and 0.059" (1.5mm) at rim where diamonds are. Arbor hole : 0.98" (25mm) Arbor size is 0.98" (25mm) a bushing any size of your choice will be included. Include a message when you check out telling me what size bushing you require. Available bushings are: 1/2"(12.7mm), 5/8" (16mm), 3/4" (20mm),  This blade will perform well on any hardness rock. Designed for use on hard lapidary materials like agate, jasper, petrified wood, agates and geodes. The diamonds are sintered into the edge of the blade. More diamonds in the sintered rim and a stiffer core make this blade cut faster and provide a long use-life. Use with light oil or water as a lubricant. New, Unused Blade - Not in Original Packaging These blades were originally packaged in oil so you will see several oil spots on the surface.  Diamonds Series blades are a great low cost choice for your lapidary saw. Regular Air postage from China to United States is FREE and takes 15-30 days delivery to your home. We will send out your order within 1-2 days after payment has been received and cleared. Please let us know if you are looking for other accessories or hardware. Should you have any queries, please contact me directly.