Related Products Electroplated diamond core drill, 25mm dia. 8mm shank. $33.00 excl GST Electroplated diamond belt, 8″ x 3″ (200 x 75mm) 240 grit $245.00 excl GST Expanding drums, 6″ x 2.5″ $160.00 excl GST 6″ lap backing plate with one threaded adapter $125.00 excl GST Quantity Add to cart Product added to wishlist. Description One 6″ lap backing plate with one threaded adapter. 5/8″ and 3/4″ right hand threaded adapters in stock, but 1″, 1/2″ right hand and 1″, 3/4″, 5/8″ and 1/2″ left hand thread can be ordered. Reviews (0) Add a Review Add to WishlistProduct added! Browse WishlistThe product is already in the wishlist! Browse Wishlist Share Category: Tools. Tags: diamond tools, Grinding wheels, lapidary, laps.