Related Products 12 x 12mm diamond bands, soft type 3000 grit $15.00 Out of Stock Spherical radiused grinding wheel 4” x 1.5” 60 grit $135.00 Electroplated diamond belt, 6″ x 2.5″ (150 x 65mm) 120 grit $160.00 12mm diamond band mandrels $12.00 Quantity Add to cart Product added to wishlist. Description 12mm x 12mm diamond bands are an alternative to solid diamond points. This is the expanding mandrel with a 3mm shaft. Add to WishlistProduct added! Browse WishlistThe product is already in the wishlist! Browse Wishlist Share Product code: 400600 Category: Diamond point sets and bands. Tags: diamond bits, Dremel bits, glass, lapidary.