The 3M™ Square/Cross Pad Mandrel secures a square pad, a cross pad, or a cross buff to a rotary tool with a 1/4 in (0.64 cm) collet assembly. The external threaded shank must match the internal threaded inserts of the pad or buff to be used. This useful accessory is available in three external thread sizes – 3-48, 8-32 and 1/4-20 external.Used for securing a square pad, a cross pad or cross buff to your 3M Die Grinder, the 3M Square/Cross Pad Mandrel allows you to make optimum use of your power tool by enabling it to accomplish more of the tasks you need to address.This mandrel has a 1/4 in (0.64 cm) shank that is engineered to fit your rotary power tool securely and allow for quick assembly. Available in 3 external thread sizes for running at a maximum RPM of 24,100.