Tiger X 4.5 inch flat flap discs are designed for aggressive grinding and long life when used on steel and stainless steel. Tiger X holds nothing back with its industry-first X3 technology that combines an advanced anchoring system, dual flap design and engineered backing. The combination delivers fast grinding AND long disc life for increased productivity._x000D_ _x000D_ The type 27 flat disc shape is ideal for smooth grinding, blending, and finishing on flat surfaces and slight contours from 0° & 15° while the 40 grit abrasive grain is best for edge beveling, chamfering, weld grinding, and blending with a grinder. This disc offers a metal 5/8" - 11 nut that allows for quick changeovers and prevents the disc from sticking to the spindle._x000D_ _x000D_ Tiger X flap disc raises the bar for those who are driven to get the job done right and done fast.