M6 x 10 = 6mm shoulder (with M5 thread) x 10mm (length of shoulder). 8mm (M6 thread)M4 Allen Key. M8 x 25 = 8mm shoulder (with M6 thread) x 25mm (length of shoulder). 6mm (M5 thread)M3 Allen Key. sizes M1.6 - M6 in A2 & A4 Stainless Steel.
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