The 'V-notch' of this sturdy block wedges on the strand for new build construction or two .750" cables fit between the frame and retaining pin for overlash jobs. The steel gate retains the cable being pulled out. The rubber roller of the M-1070-1R supports a cable up to 1½". Also known as slap on roller, clip on, roller, fiber roller, overlash roller, coffin roller, overlash blocks, cable rollers