Other reviews talk about usage, I agree with this usage, I often use this type of clips so I bought this type (2nd set) at a great price. Competition: These Milescraft are 1/2 the price of the brand name (R ***** R), they are equivalent in size. These Milescraft have nice anti-scratch pads which the R*****R brand doesn't have Negative comparison head goes to the competition: {so 4 stars for ease of use} I also know - the threads don't work as smoothly as the R*** brand *R considering these are quite functional and if I didn't have an R****R branded kit I wouldn't even know.