Lyman Pro Headspace Gauge 6.5 CREED Silver. Pro Headspace gauges check maximum and minimum cartridge headspace as well as maximum case length. Headspace gauges are recommended when setting up sizing dies for any bottle neck cartridge. Specifications for Lyman Pro Headspace Gauge: Manufacturer: Lyman Fabric/Material: Stainless Steel Weight: 0.2 lb Color: Silver Features of Lyman Pro Headspace Gauge Precision machined from corrosion resistant stainless steel for a long rust-free life Outside flats prevent rolling O-rings provide a non-slip grip Package Contents: Lyman Pro Headspace Gauge Lyman 7705103: Pro Headspace Gauge 6.5 CREED Silver