50mm P36 Zirconium Abrasive Quick Change Sanding Discs. A fast and easy quick change mechanical securing system that allows discs to be firmly held and prevents them from moving during operation. Discs are of a strong construction and coated with a sharp highly efficient zirconium abrasive. Grit 36 is ideal for stock (weld) removal and grits 60 -120 are more suited to the removal of imperfections and blending work. An outstanding quick change sanding disc range for general use applications, including blending light welds, breaking edges and removing parting lines and machine marks. These versatile discs can be used for working mild contours as well as flat surfaces and are most effective when used with pneumatic tools. Features: Quick change fastener. Twist on and twist off available with a male thread. Twist on and twist off threaded discs are equivalent to 3M™ Roloc™ fastening system. Benefits: Quick, tool-free disc changes allow for more grinding time. Disc locks securely to back-up pad, but is easily removed. Mount to the appropriate Quick Change back-up pad. Discs can access restricted corners and contours. Price per 10 discs.