Trouble getting to the regular 17mm or even the small 15mm wrench size nuts holding your downpipe to the turbo? Other tight quarters that make it a pain to get the large socket or wrench on? These are hard to find M10x1.25 high temperature copper clad bolt with only 14mm wrench/socket size. The small outside size (normal size is 17 or in some case already special 15mm) makes them highly desirable for tight spots, particularly on manifolds or turbo flanges. Listing is for quantity 4 copper coated steel nuts. Orders received by 11 am EST ship SAME DAY including Saturdays. We ship USPS and offer First Class, Priority and Priority Express (1-2 days guaranteed).