Base for mounting a lock square on a front wall of an opening element, this front wall having an inner face delimiting a hollow cavity of the opening element and a through orifice, with the base comprising: - a main body having a boring able to receive a lock square, - means of fastening to the through orifice of the front wall of the opening element, the means of fastening comprise at least one flexible finger, referred to as embedding finger, extending protruding from the main body along a longitudinal direction, comprising: ∘ at least one hook: ▪ extending protruding transversally to the longitudinal direction, ▪ arranged to be able to be introduced into the orifice of the front wall of the opening element from an outer face of said front wall of the opening element, opposite said inner face, ▪ having a blocking surface arranged in order to be able to be placed, while the main body of the base is bearing against the outer face of the front wall of the opening element, at least partially against the inner face of the front wall of the opening element, characterised in that it further comprises at least one flexible finger, referred to as maintaining finger: - extending from the main body, - comprising at least one hook having a blocking surface arranged in order to be able to be placed at least partially against a face, referred to as maintaining face, of a collar of a lock square in order to assemble and block in translation the lock square to the main body of the base while still authorising the rotation of the lock square in the boring of the main body of the base. - a main body having a boring able to receive a lock square, - means of fastening to the through orifice of the front wall of the opening element, the means of fastening comprise at least one flexible finger, referred to as embedding finger, extending protruding from the main body along a longitudinal direction, comprising: ∘ at least one hook: ▪ extending protruding transversally to the longitudinal direction, ▪ arranged to be able to be introduced into the orifice of the front wall of the opening element from an outer face of said front wall of the opening element, opposite said inner face, ▪ having a blocking surface arranged in order to be able to be placed, while the main body of the base is bearing against the outer face of the front wall of the opening element, at least partially against the inner face of the front wall of the opening element, characterised in that it further comprises at least one flexible finger, referred to as maintaining finger: - extending from the main body, - comprising at least one hook having a blocking surface arranged in order to be able to be placed at least partially against a face, referred to as maintaining face, of a collar of a lock square in order to assemble and block in translation the lock square to the main body of the base while still authorising the rotation of the lock square in the boring of the main body of the base. ∘ at least one hook: ▪ extending protruding transversally to the longitudinal direction, ▪ arranged to be able to be introduced into the orifice of the front wall of the opening element from an outer face of said front wall of the opening element, opposite said inner face, ▪ having a blocking surface arranged in order to be able to be placed, while the main body of the base is bearing against the outer face of the front wall of the opening element, at least partially against the inner face of the front wall of the opening element, characterised in that it further comprises at least one flexible finger, referred to as maintaining finger: - extending from the main body, - comprising at least one hook having a blocking surface arranged in order to be able to be placed at least partially against a face, referred to as maintaining face, of a collar of a lock square in order to assemble and block in translation the lock square to the main body of the base while still authorising the rotation of the lock square in the boring of the main body of the base. ▪ extending protruding transversally to the longitudinal direction, ▪ arranged to be able to be introduced into the orifice of the front wall of the opening element from an outer face of said front wall of the opening element, opposite said inner face, ▪ having a blocking surface arranged in order to be able to be placed, while the main body of the base is bearing against the outer face of the front wall of the opening element, at least partially against the inner face of the front wall of the opening element, - extending from the main body, - comprising at least one hook having a blocking surface arranged in order to be able to be placed at least partially against a face, referred to as maintaining face, of a collar of a lock square in order to assemble and block in translation the lock square to the main body of the base while still authorising the rotation of the lock square in the boring of the main body of the base.