Fully machined from 17-4 PH heat treated stainless steel billet. Each Precision Armament Accu-Lug Recoil lug is precision surface ground then put through a three point thickness inspection to verify a uniformity of +/-.0001" or better before leaving the factory. Features tapered sides and rounded corners to prevent damage to bedding during removal and installation.High-Performance Accu-Lug: .312" thick with oversize 1.075" bore to fit blueprinted/trued actions that require larger barrel threads. Features a unique computer FEA optimized geometry to maximize stiffness to weight ratio. This reduces flex during recoil for a more uniform pressure on bedding material. Three 3/32" pin holes on back side allow optional single or double pinning to receiver (2 pins included). All Pin holes are blind drilled from back side for positive pin retention and feature the same .605" pattern radius as the popular Holland Recoil Lug.Standard Accu-Lug: .250" thick with standard 1.065" diameter bore.Over...