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High Density Trimmable Zirconia Flap Discs

Mercer Abrasives features flap discs in two distinct types: 

Type 27 flat shaped discs are working on flat surfaces.  They are most efficient when used between a 0 and 15 degree angle.  These are the best choice for smooth finishing. 

Type 29 conical shaped discs are angled at 10 degrees, which makes them ideal for contour and edge work. The angled flaps on this disc give more surface area contact for an aggressive cut.  Most efficent when used between 15 and 25 degree angle.