Enhance the performance of your high-tech boat with the Harken 16mm Air Block – 404. As Harken’s smallest block, it is specifically designed for small control lines. The block features a patented bearing system with stainless steel balls in a captive grooved race, ensuring smooth operation and durability. With a maximum working load of 113kg (250 lb), this block offers strength and reliability for your sailing needs. The 404 model also includes an O-ring to securely hold the line in the sheave during intermittent loading.