Dia. 17 - 3/4 in. OEM: MC# 48 - 18616A40. Pitch 21. RH Rotation. MERCRUISER - 4.3L 155 - 250 HP (95 & Newer), 5.7L 210 - 300 HP (01 & Newer), 7.4L 300 - 385 HP (96 & Newer), 496 375 - 425 HP (96 & Newer), D2.8L 150 HP (96 and Newer), D4.2L 200 - 250 HP (94 & Newer). Delighting customers by providing the best engine and propulsion solutions for the world's most demanding environments. We will conduct ourselves at the highest level of ethical standards. We do what we say, and say what we do. We listen to customers and provide them with superior products and services. We promote the sustainable use of resources in both the development and manufacture of products, and in the communities and environments where our products are produced and used. We provide innovative, high quality products and services that deliver reliable, easy to use solutions and drive passion for our brand.