The Ncstar Vice Block Tool for Glock is a precision-engineered gunsmithing accessory made from anodized blue aluminum designed to securely hold Glock slides during maintenance and service work.Ncstar Vice Block Tool for Glock pistolsAnodized blue aluminum construction for durabilityCompatible with Standard Compact and Subcompact framed modelsSupports multiple calibers: 9mm .40 .45 10mm .357 SIG .45 GAPInserts into frame rail grooves for secure mounting in vise jawsNot compatible with slimline models: 42 43 43X 48Essential for gunsmiths and firearm enthusiasts performing slide maintenance this vise block provides stable secure positioning while protecting the slide finish during service operations.