Although it was able to be set with 74 originally attached, it had been processed. I want to return to a non-processed one and purchased for 75 purpose. Round part (not screw part) It was slightly larger than what was attached with diameter, but there is no problem with installation and use. The price is not complicated at all. I think the purpose of set selling is almost a setting, but the 5 steps are slightly coarse. You may buy it if you have 2.5 increments, but you do not have to buy the same one anymore.