These rotary tool mandrels are 3/8" diameter with a 1/8" shank. Simply adjust the screw to replace your sanding sleeves.
Choose your Sanding bands by grits, sold in packs of 25. Glue bonded, silicon carbide grit for fast shaping and sanding. Fine = 120 Grit, Medium = 80 Grit, Coarse = 60 Grit. 1/2" Long, 3/8" diameter.