Our 3M Orbital File Shoe Base Plate features a 2-3/4??x 10??size for fast, easy attachment to Hutchins models 3800, 3804 and 4932 and other 10??orbital air file sanders with dust vacuum systems. This base plate readily accepts adhesive for use with a full range of 3M abrasive sheets, and features a hole configuration that helps channel dust away from the sheet surface for longer abrasive life.