The spring washers are the strong (square bodied) type that do not splay outwards (like the round bodied ones do) when you tighten them. 7mm Flat Washers and 7mm Spring Washers.
These 7mm Metric M7 Washers, Flat Washer & Spring Washer - x28 would be best fit in applications requiring precision alignment and stable support, such as construction, automotive, or electronics industry.
