A saw comprising: a base assembly (6, 100); a base mounted on the base assembly (6,100); two parallel guide rods which are rigidly attached to the base and which extend across the base assembly (6,100); a cutting unit slideably mounted on the two guide rods which is capable of being slid along the length of the guide rods over the base assembly (6, 100); wherein the length of one of the guide rods is longer that the length of the other guide rod so that it extends further across the base assembly (6,100); wherein the base is pivotally mounted on the base assembly (6,100) to enable the guide rods and cutting unit to move towards or away from the base assembly (6,100); characterised in that the longer guide rod locates above the shorter guide rod; wherein the longer guide rod comprises an end stop formed on the end of the longer guide rod which engages the cutting unit when the cutting unit is slid along the guide rods away from the base to limit the amount of sliding movement of the cutting unit away from the base; wherein the cutting unit comprises a motor mount, the motor mount having at least two brackets (502; 508), a first bracket for holding a slide bearing, the longer guide rod passing within the slide bearing and a second bracket through which the shorter guide rod passes, the cutting unit being able to slide along the guide rods by the brackets (502,508) and slide bearings sliding along the guide rods; wherein the end stop formed on the end of the longer guide rod engages with the side of one of brackets (502:508) with a slide bearing of the cutting unit when the cutting unit is slid along the guide rods away from the base. a base assembly (6, 100); a base mounted on the base assembly (6,100); two parallel guide rods which are rigidly attached to the base and which extend across the base assembly (6,100); a cutting unit slideably mounted on the two guide rods which is capable of being slid along the length of the guide rods over the base assembly (6, 100); wherein the length of one of the guide rods is longer that the length of the other guide rod so that it extends further across the base assembly (6,100); wherein the base is pivotally mounted on the base assembly (6,100) to enable the guide rods and cutting unit to move towards or away from the base assembly (6,100); characterised in that the longer guide rod locates above the shorter guide rod; wherein the longer guide rod comprises an end stop formed on the end of the longer guide rod which engages the cutting unit when the cutting unit is slid along the guide rods away from the base to limit the amount of sliding movement of the cutting unit away from the base; wherein the cutting unit comprises a motor mount, the motor mount having at least two brackets (502; 508), a first bracket for holding a slide bearing, the longer guide rod passing within the slide bearing and a second bracket through which the shorter guide rod passes, the cutting unit being able to slide along the guide rods by the brackets (502,508) and slide bearings sliding along the guide rods; wherein the end stop formed on the end of the longer guide rod engages with the side of one of brackets (502:508) with a slide bearing of the cutting unit when the cutting unit is slid along the guide rods away from the base.