These are replacement insert modules for Glock® pistols to be used in Ergo’s MAST™ Modular Armorer STand™ System. Ergo’s MAST™ modules for Glock® can be clamped in a bench vise, bolted to the side of a bench, or inserted in the Ergo’s MAST™ base to support your pistol for display, maintenance, cleaning, or storage. Small Frame Module holds double-stack Glock® pistols chambered in 9mm, .357 SIG & .40 S&W Ergo MAST™ modules for Glock® are made of rugged reinforced molded polymer, with two hardened stainless steel pins that lock the insert module into the base.