• Use for block and head resurfacing; vertical milling and boring
• Smoothest, Cleanest, Most Accurate Finish on the Market
• 1/2" Diameter x 1/8" Thick
• Requires a 1/16" Shim 
• Polycrystalline Diamond - Super-abrasive for Aluminum
• Single-Sided, Edge Honed

Polycrystalline Diamond Insert, 1/2" Diameter x 1/8" Thick, Single Sided, Edge Honed (PCD - Polycrystalline Diamond -Super-abrasive for Aluminum). For engine block and head surfacing, Vertical Milling and Boring. Needs a 1/16" Shim WVN819296-1