Perko’s plain zinc alloy ribbed type rowlock horns. Specifications include Easy installation.. We strive to provide new innovative products to meet the need of the rapidly changing world we live in. Our goal is to provide products made with the finest material and consistent and high quality processes.. Features 1262DP0ZNC Ribbed Type Rowlock Horns; Superior Quality and Performance; Zinc alloy ribbed type rowlock horns; Specifications Shank O.D: 1/2″; Shank Length: 1-3/4″; Between Horns: 1-3/4″; .