8mm X 30mm 內六角螺絲

The hex socket drive is machined cleanly, so my Allen key seated perfectly without any wobble. Tossed these into my gearbox rebuild and they threaded in smooth with zero binding, a solid upgrade over the factory bits.

Used these to replace some worn bolts on a metal rack; the 8mm head fit perfectly into the socket and the finish looks durable. No issues with stripping so far, and the price was fair for a pack of ten.

The threads are clean and the hex drive fits my wrench perfectly, so it seated without any wobble. It's a solid replacement part, exactly the size I needed to fix my rig.