Bolt or clamp this armorer block to a bench or other work surface to hold a AR-style firearm securely in place for cleaning, maintenance or storage. Manufactured from glass filled polymer as a single unit for strength and durability. Will not mar or damage firearm finish. Fits firearms including the AR-556® and SR-556®. Block measures 6-1/8" tall x 4-5/16" long (at the base) x 2" wide (at the base). Weighs 4.3 oz. Block is drilled for (4) 1/4" mounting holes. Made in the USA by ERGO® Grips.