WIDIA™ M690 90˚ Shoulder Mill Series M690 SD1204.. | M690 SD1506.. Strong and specially designed to streamline most milling operations, M690 Series 90º shoulder mills enable excellent shoulder finishes, enhanced chip evacuation, and optimal insert support. • Sturdy tool design for maximum safety and productivity. • Four cutting edges for economical and reliable machining. • Superior shoulder finishes and smooth cutting action. To learn more, contact your local Authorized Distributor or visit www.widia.com.