Perko Deck Plate Key Black 1247-DP0-BLK by Perko $9.43 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Perko Deck Plate Key #9-1247DP0BLK 1" spade length and 1-3/4" overall length. Black Plastic Fits 1-1/4" and 1-1/2" deck plates and many other "Slot" type opening deck plates 1-1/8" center to center of lugs.