M3-0.5 x 18mm 內六角圓頭螺絲 | 六角驅動 | 全牙 | 12.9級合金鋼鍍鋅（600入/包）

I've been using these M3 socket cap screws for building jigs in my shop, and the 12.9 alloy steel is noticeably tougher than the standard stuff I've tried before. The zinc plating on the 600-piece pack looks consistent and should hold up well against minor rust.

The hex socket drive on these M3 screws fits my driver bits perfectly with zero wobble, and the 12.9 alloy steel feels noticeably tougher than standard hardware. I used a full bag for a jig assembly and not a single stripped head or burr.

Finally, a box of M3s that actually has enough for a full build without me rationing them. The 12.9 alloy steel feels properly hard when torquing down, and the zinc plating is uniform with no flaking.