Barranca Professional grade lapidary diamond blade. Used for cutting gemstones in the jewelry making industry. BD-301 Blades. Sizes available by part number. Part number 128377 (4 inch.012x1/2) Part number 128378 (4 inch.012x5/8) Part number 128306 (6inchx.025x5/8) Part number 128376 ( 6inchx .025x5/8-1/2) Part number 127118 (8inch x.032x5/8-1/2) Be sure to indicate correct part number based on size needed. Costs vary with the size of the blade. New item. Free shipping.