M4 x 20mm 內六角螺絲 | 圓頭內六角驅動 | 合金鋼 (300個/包)

The hex socket drive on these M4 bolts made assembly a breeze, and the button head sits flush against my fixture plates. The alloy steel feels sturdy and machined consistently across all 300 pieces, which is exactly what I need for repeat jig setups.

I needed a bulk pack for a jig I was building, and the uniform finish on these M4 button heads is spot-on. The 300-count box actually arrived sealed and undamaged, which saved me a trip to the hardware store.

Finally, a pack of socket cap screws that actually have clean, sharp threads. The hex socket drive grabbed my Allen key perfectly without any slippage while I was assembling a jig.