Dotco 10-27 & 12-27 Series – Heavy Duty Head – Sander/Grinder – 5/8″-11 Threaded Spindle are available in both aluminum and composite housing. Dotco 10-27 & 12-27 Series – Heavy Duty Head – Sander/Grinder – 5/8″-11 Threaded Spindle feature a high output motor for demanding sanding applications in all industries. Dotco 10-27 & 12-27 Series – Heavy Duty Head – Sander/Grinder – 5/8″-11 Threaded Spindle also feature a heavy duty low profile head for superior durability.