(1) Be a more visible leader of safety initiatives. It's important that employees see you as the action person who does not let safety issues go unanswered. Your response to issues helps build trust in the process and the overall efforts put forth by the safety department. (2) React quickly to safety issues / concerns that are raised. You don't want to be considered a black hole when it comes to safety. Employees that raise concerns want answers.
Yes they do. Any circular saw should have the size right on the saw some where. Standard is 7 1/4  NOT 7 1/2 For wood cutting blades 7 is standard for concrete (Masonry) or metal cutting blades. I guess you are in the UK or somewhere then. The 165 mm is equivalent to a 6 1/2  saw in the states. That would be the standard size for a cordless battery operated circular saw here.
Metal-cutting jigsaw blades have tiny but hard, sharp teeth that can cut through most mild metals, including sheet metal, wood with nails embedded in it, bolts, hinges, and galvanized and copper pipes. The correct blade to use depends on the thickness of the metal being cut. Hold the saw blade against the edge of the metal and confirm that at least three teeth contact the edge. If not, choose a blade with more teeth. Metal-cutting jigsaw blades typically have 21 to 24 teeth per inch (TPI).