Adjust it smaller to slide in sand drum or adjust it bigger to hold sand drum tight. Easy Installation - Push the rubber mandrel into the sand drum, and then tighten the screws on the top. Application - Good accessories fit for drum sander or rotary grinders. Adjust it smaller to slide in the sand drum or adjust it bigger to hold the sand drum tight Good accessories fit for drum sander or rotary grinders. It's crucial to ensure that the sleeves are adaptable to the drum's size to achieve proper fit and performance. 1 Inch Polishing Wheels Mandrel SE 1-Inch Soft White Wool Polishing Wheels – 36-Pack With 1/8 Shank Mandrels For Detail Buffing Soft Wool Polishing Wheels The 3/8 inch size is perfect for detailed work - sanding curves, inside corners, and hard-to-reach spots. The 2.35mm shank fits most standard rotary tools and drum sanders Push the rubber mandrel into the sand drum, and then tighten the top screw. Mandrel head size can be adjusted with the screw on the top. Application - Good accessories fit for drum sander or rotary grinders. Sanding Attachment For Drill HARFINGTON 10pcs 3/8" Sanding Drum Mandrels | 1/8" Shank 3/8 Inch Sanding Sleeve Holder Adjust it smaller to slide in the sand drum or adjust it bigger to hold the sand drum tight.