Harken^® Micro Cheek Block is appropriate for all control applications on smaller boats where up to 1/4" (6mm) line is used. It is specifically designed to be mounted to a flat surface such as a boom or mast. Compact and lightweight with a sheave diameter of 7/8" (22mm), these blocks have a fast trim and release under both high and low loads. This low-friction Cheek Bullet Block leads control lines 90° and is ideal for vangs, outhauls, cunninghams, spinnaker controls, traveler controls, barber haulers and more.