Easily attaches to the blade of your caliper with a thumbscrew and uses interchangeable insert bushings to measure from the bullet ogive.
Includes the Lock-N-Load Comparator body and all 14 bullet inserts for bullet diameters: .172", .204", .224" (5.56mm), .243" (6mm), .257", .264", .277", .284" (7mm), .308" (7.62&8mm), .338", .358", .375", .458", .416".