A modular system for removable mounting of replaceable parts to a jaw assembly of a demolition tool, the modular system comprising: a wear plate comprising: a body element configured to saddle an at least one first coupling portion disposed on a first jaw of the jaw assembly; an active module comprising: a body member configured to be mountable to the at least one second coupling portion disposed on the first jaw adjacent to the at least one first coupling portion; and at least one brace disposed on a side of the body member, characterised in that the modular system further comprises: a pair of spaced apart first engagement elements extending from an end of the body element for engaging to first protrusions provided on the at least one first coupling portion; and a pair of spaced apart second engagement elements extending longitudinally from an opposite end of the body element for engaging to the second protrusions provided on the at least one first coupling portion, wherein the at least one brace is configured to extend over the second engagement elements such that when the wear plate and the active module are assembled on the first jaw the brace extends over the second engagement elements to retain the wear plate on the first jaw. a wear plate comprising: a body element configured to saddle an at least one first coupling portion disposed on a first jaw of the jaw assembly; a body element configured to saddle an at least one first coupling portion disposed on a first jaw of the jaw assembly; an active module comprising: a body member configured to be mountable to the at least one second coupling portion disposed on the first jaw adjacent to the at least one first coupling portion; and at least one brace disposed on a side of the body member, characterised in that the modular system further comprises: a pair of spaced apart first engagement elements extending from an end of the body element for engaging to first protrusions provided on the at least one first coupling portion; and a pair of spaced apart second engagement elements extending longitudinally from an opposite end of the body element for engaging to the second protrusions provided on the at least one first coupling portion, wherein the at least one brace is configured to extend over the second engagement elements such that when the wear plate and the active module are assembled on the first jaw the brace extends over the second engagement elements to retain the wear plate on the first jaw. a body member configured to be mountable to the at least one second coupling portion disposed on the first jaw adjacent to the at least one first coupling portion; and at least one brace disposed on a side of the body member, characterised in that the modular system further comprises: a pair of spaced apart first engagement elements extending from an end of the body element for engaging to first protrusions provided on the at least one first coupling portion; and a pair of spaced apart second engagement elements extending longitudinally from an opposite end of the body element for engaging to the second protrusions provided on the at least one first coupling portion, wherein the at least one brace is configured to extend over the second engagement elements such that when the wear plate and the active module are assembled on the first jaw the brace extends over the second engagement elements to retain the wear plate on the first jaw. a pair of spaced apart first engagement elements extending from an end of the body element for engaging to first protrusions provided on the at least one first coupling portion; and a pair of spaced apart second engagement elements extending longitudinally from an opposite end of the body element for engaging to the second protrusions provided on the at least one first coupling portion, wherein the at least one brace is configured to extend over the second engagement elements such that when the wear plate and the active module are assembled on the first jaw the brace extends over the second engagement elements to retain the wear plate on the first jaw.