The Harken 29mm Through-Deck Bullet Block (Part No. 088) is equipped with a 29mm sheave, or 1 1/8 inches in diameter, making it compatible with maximum line diameters of 8mm or 5/16 inches. With a maximum working load of 136kg or 300lbs, these low-friction blocks are ideal for controlling lines in a variety of situations. Their compact and lightweight design allows for quick and efficient trimming and release, even under high or low loads. Choose from a variety of styles to find the perfect fit for any control line application.