HOLO-KROME 86030 M6-1 x 15mm 內六角螺絲 | 圓頭六角驅動 | 合金鋼熱處理黑色氧化（100個/包）

Needed a batch for a jig I'm building on the mill, and these button heads fit the counterbores perfectly. The hex socket drive felt snug in my Allen key without any wobble, and the black oxide finish cleans up easily.

The black oxide finish on these screws made them look great on my precision assembly project, and they threaded smoothly into tapped holes without any binding. I’ve used cheaper bolts before that stripped easily, but these held torque nicely.

Used these for a jig I was assembling and the black oxide coating gives them a nice uniform look once torqued down. Fit was snug in the M6 tapped holes, which is exactly what I want for precision tooling. The 100-count pack means I won't run out for a while, and none had any burrs on the threads.