Related Products Electroplated diamond belt, 8″ x 3″ (200 x 75mm) 400 grit $240.00 excl GST Resin diamond belt, 6″ x 1.5″ (150 x 37mm) 280 grit $40.00 excl GST 12mm diamond band mandrels $12.00 excl GST 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.