Dial Caliper Body for your Modular Headspace Comparator assembly. Now available with 2 mounting configurations: "Centered" for normal use, "Offset" for use with Hornady COAL Tools. ***Body is required to use Bullet and Headspace Inserts*** This is the body only for the Modular Headspace Comparator tool. You must purchase the body for the Modular Headspace Comparator inserts to work. Available in two configurations. Standard: The longest of the two configurations, works with loaded ammunition up to 338 Lapua Magnum with solid turned bullets. Short: The shortest body of the two configurations. More compact when the customer wants to dedic Mfg: Short Action Customs