3M square/cross pad mandrel. Used for tightly securing square pads and cross pads. Comes with #8-32 internal threaded inserts. Attachment type: threaded. Converted form: mandrel/spindle. Equipment - machines: die grinders. Form type: square/cross pad. Length: 3-inches. Max rpm: 24100. Overall length: 3-inches. Shank size: 1/4-inches. Thread size: 1/4-20 external.