https://www.fastenerdata.co.uk/fasteners/plugs/socket.html
Fastenerdata - Socket Head Plug - Fastener Specifications
socket head plugfastenerdataspecifications
https://www.diversitech-global.com/ru/tools/5pc-3%2F16-%26-5%2F8%22-spark-plug-socket-tune-up-tool-kit.-includes-flexible-head-ratcheting-handle
5pc 3/16 & 5/8" Spark Plug Socket Tune-Up Tool Kit. Includes Flexible-Head Ratcheting Handle
Designed to simplify vehicle maintenance tasks, this comprehensive 5-piece set is a must-have for any toolkit. Crafted from heat-treated alloy steel, it...