HOLO-KROME 76780 M12-1.75×12mm 소켓 캡 나사 | 육각 소켓 드라이브 | 합금강 열처리 블랙 옥사이드 (100개/팩)

The black oxide finish really holds up without any rust or chips after a week of assembly work on my tooling setup. Threads cut clean and seat perfectly every time, no chasing needed. Solid batch for the price.

Used these on a jig I was assembling and the black oxide finish handled the shop grime without a hint of rust. The socket drive seated perfectly with my hex key, no stripping or wobble on the first torque pass. Pack of 100 gives me plenty of spares for future tooling repairs.

Threads were clean and cut smoothly into my jig fixture without any binding—exactly what I needed for a tight assembly. The uniform black oxide coating is a bonus for corrosion resistance in my shop.