Spine, Stiffener, for 9 inch (228mm) DOVETAIL SAW, BRASS, 3/16 x 5/8 inch (4.76 x 15.88mm), Slot Depth 0.250 inch (6.35mm), for Blade Thickness of 0.015 inch (0.381mm)
Used on high speed bench grinders usually with buffing compounds to polish metal. Sisal mops are the coarsest fibre similar to that in rope and act as a strong and aggressvie carrier for your choice of cutting compound.