Can anyone point me in the direction of a 5 inch or approx 125-130mm holesaw that would last long enough to cut 2 holes for my cooler pipes in my inner guards? I was going to plasma cut but i want a neater finish, my old holesaws are so knackered they can barley scratch the paint, what brands have you actually used on metal and had last more than 30 seconds? Ive tried a few brands over the years and most die too quick.