The Hornady Lock-N-Load Bullet Comparator Anvil Base Kit is perfect for the reloader looking to take accurate measurements of reloaded ammunition. When used with the Hornady Lock-N-Load Bullet Comparator (Sold Separately) the anvil base allows you to measure uniformity of ammunition from the base of the loaded round to the ogive of the bullet. The anvil base quickly and easily attaches to any caliper in seconds. Notes: This base does not accept inserts and is used to help keep loaded rounds between the caliper when measuring with the Lock-N-Load Comparator (Sold Separately)Specifications and Features: Manufacturer No. AB1 Hornady Lock-N-Load Anvil Base Kit Multi-Caliber Compatible with Hornady Lock-N-Load Gauges Measures Cases Red Finish