Norseman Gibb's T-Ball Terminals are manufactured from grade 316 stainless steel. They are specifically designed to be matched with their metrically or imperially-dimensioned wire rope. The head is stamped with a metric (using whole numbers and decimal points) or imperial (using fractions) measurement. In some cases it will be stamped with a whole number and a fraction, indicating the metric size followed by the imperial size. NT74106 is suited for 3/16 in ball terminals and has a head height of 7/16 in (11.1mm). The head stamp saysﾓ3/16 in. Note: Very old J/24's with old-style 3/16 in. terminals may want to see if they fit new 5/32 in. or 3/16 in. backing plates. Checking head lengths may also help you determine what you have: a 7/16 in. head is a new head style, whereas a 3/8 in. head is the old style.