Related Products 6″ lap backing plate with one threaded adapter $125.00 excl GST Diamond lap disk 6” PSA backing 600 grit $37.50 excl GST Diamond saw blade 250 x 1.0 mm $55.00 excl GST Electroplated diamond core drill, 15mm dia. 8mm shank. $22.00 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: 450015 Category: Core drills. Tags: core drills, Diamond drills, glass, glass work, lapidary.