Mercer Industries 660400 Blue Lightning Turbo Diamond Blade, 4-Inch 4-Inchx.080x7/8-Inch, 20mm, 5/8-Inch High diamond concentration - allows the blade to last longer and increase efficiency Tensioned and balanced - no wobble when using blade Steel core with proprietary diamond bond Lasts 100x longer than an abrasive blade High diamond concentration Special bond construction Tensioned and Balanced Hot pressed technology No wobble while using blade