Evolution Gun Works Ammo Chamber Checker .308 7-Hole. The EGW Chamber Checker is developed with the actual Clymer reamers that are used to chamber barrels. Made using a solid 6061 T6 aircraft grade aluminum material with an anodized matte black finish the Evolution Gun Works Ammo Chamber Checker has the strength and durability you'll need to use it year after year. Specifications for Evolution Gun Works Ammo Chamber Checker: Manufacturer: Evolution Gun Works Quantity: 1 Color: Black Condition: New Fabric/Material: 6061-T6 Aluminum Finish: Matte Features of Evolution Gun Works Ammo Chamber Checker: Solid 6061 T6 aircraft grade aluminum EGW uses the actual Clymer reamers that are used to chamber barrels Anodized matte black for durability Now measures overall length Package Contents: Evolution Gun Works Ammo Chamber Checker Evolution Gun Works 70165: Ammo Chamber Checker .308 7-Hole