Create mortise pockets in large timbers. No router or hand method can match the speed and accuracy of Woodworker's Supply radial arm saw mortising attachment: In addition to making precise 90° cuts, angled mortises are as easy as using your saw's controls - just as you would to make a miter cut. Designed primarily for timber framers, this versatile tool can be used in furniture making as well. Guard retracts when it contacts workpiece; adjustable depth gauge for consistent and accurate cuts. 6-7/8" maximum cut depth. 1/4" thick x 2-3/8" wide bar with chain. 2,150 FPM chain speed. 9" square maximum timber size. 1-3/16" radius in bottom cut. 1/2" minimum cut distance from table surface; 4-1/2" maximum. Fits DeWALT, Craftsman and later model DELTA 10" and 12" radial arm saws. U.S. Patent No. 5,413,158.