Perko - Skene Bow Chocks Port and Starboard Pair - 3-1/2" - 1223DP0CHRPerko Skene Bow Chocks Port and Starboard Pair 3 1 2" 1223DP0CHR Perko Inc. is a privately owned, fourth generation family corporation. Originally founded as F. Persky & Co. in 1907 and then became Perkins Marine Lamp Corp in the 1917. The original product line consisted of hand formed and soldered navigation lights, ventilators and chart cases fabricated from brass, copper and galvanized steel. Over one hundred years later, Perko, Inc. still produces