Check the listing for details. CBN Insert, 3/8" Round, 1/8" Thick, Double Sided, T-Land Chamfered Edge. Condition: New. Listed at 229.99 USD. Use for block and head resurfacing; vertical milling and boring.Smoothest, Cleanest, Most Accurate Finish on the Market3/8" Round, 1/8" ThickDouble Sided, T-Land Chamfered Edge 10 Deg. 0.005"Cubic Boron Nitride - SUPERABRASIVE CBN Insert, 3/8" Round, 1/8" Thick, Double Sided, T-Land Chamfered Edge 10 Deg. 0.005" (CBN - Cubic Boron Nitride - SUPERABRASIVE). For engine block and head surfacing, Vertical Milling and Boring. Winona Van Norman has long been a trusted brand in automotive rebuilding, industrial cleaning solutions, as well as consumer blasting and tumbling. Located in the heartland of America in Wichita, Kansas, Winona Van Norman has been synonymous with manufacturing excellence for decades. As an industry leader, WVN provides machines, parts, and supplies to assist heavy industry applications as well as home consumers with blasting and tumbling products.