Related Products 6″ lap backing plate with one threaded adapter $125.00 excl GST Flat diamond grinding wheel 6” x 2” 240 grit $205.00 excl GST Sintered diamond point 5mm dia, 3mm shank $20.00 excl GST Electroplated diamond core drill, 8mm dia. 8mm shank. $13.00 excl GST Quantity Add to cart Product added to wishlist. Add to WishlistProduct added! Browse WishlistThe product is already in the wishlist! Browse Wishlist Share Product code: 450008 Category: Core drills. Tags: core drills, Diamond drills, glass, glass work, lapidary.