Professional Shotgun Bore Micrometer Set - Complete Dial Bore Micrometer Set

Measures bore diameter, choke constriction, chamber (except 10 gauge chambers) and forcing cone dimensions. Shows dents, bends and other imperfections. Very accurate, .001", direct-reading dial indicator, is mounted on 16A 1/2" long shaft on which the appropriate gauge head is installed. Includes well written instructions. Mfg: 100 Straight Products SPECS: Tool steel heads and gauging rings. Maximum measuring depth: 15-3/8" (39.0cm). Complete Bore Mike Set includes 4 Heads (12, 20, 28, .410 - NOT 10 or 16 gauge), 4 Gauging Rings, Indicator, Shaft and Instructions, all in a Wood Case.