There are two assemblies in the binding, a harness assembly and an attachment assembly. The harness assembly attaches to a ski boot and has a toe fitting which fits over the toe of the boot and has a flat metal plate contacting the toe portion of the sole of the boot. Four sharp pointed posts extend downward from the plate. Each post has a groove near its base, perpendicular to the axis of the post. The attachment assembly attaches to the ski and has latch bars which engage the grooves in the posts to attach the attachment assembly and ski to the harness and ski boot. One latch bar is spring loaded toward the other and as the posts are inserted onto the attachment assembly the spring loaded bar is moved to allow the posts to pass. When the posts are fully inserted the spring loaded bar moves to capture the posts. There is a lever operated cam at the forward end of the attachment assembly which is used to separate the latch bars to enable detaching the ski from the harness. With the ski and attachment assembly removed, the sharp posts serve the crampon function.