The L.E. Wilson Case Gage Depth Micrometer is designed to help reloaders accurately measure shoulder bump and headspace before and after sizing. Whether you’re fine-tuning a full-length sizing die or verifying brass consistency, this tool provides repeatable precision in .001" increments. Perfectly compatible with all L.E. Wilson case gages (with limited compatibility for 50 BMG), it slips directly over the top of your gage to deliver consistent measurements. The included Gage Block helps ensure your micrometer is zeroed before use, providing reliable results across multiple calibers.