(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.
Circular Saw Blade Types and Uses. Some circular saw blades are suited for stationary tools like table saws and compound miter saws, while others are suited for handheld circular saws. Know which blade your cutting tool will accept and make sure the blade you are considering is correct for the tool you'll be using.