Related Products Diamond lap disk 6” PSA backing 360 grit $33.00 excl GST Electroplated diamond core drill, 35mm dia. 10mm shank. $42.00 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.