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The PROTO J54206 is a 15-piece metric standard socket set designed for professional-grade fastener work across HVAC, mechanical, and general trade applications. Built on a 1/2 inch drive, the set covers sizes from 10 mm to 24 mm and features a 12-point geometry on each socket. The chrome finish provides corrosion resistance for shop and field environments. Each socket is manufactured to standard depth for straightforward bolt and nut engagement on the most common metric fastener sizes encountered in equipment service and installation work.
This socket set is suited for residential and commercial trade work where metric fasteners are prevalent, including HVAC equipment installation, refrigeration system service, and mechanical assembly. The 1/2 inch drive platform is a standard choice for mid-torque applications, compatible with commonly available breaker bars, torque wrenches, and ratchets in that drive size. Technicians working on rooftop units, split systems, or mechanical rooms will find the 10 mm through 24 mm range covers the majority of hardware encountered on those systems.
Designed as a standard 1/2 inch drive metric socket set for general trade and professional service use across applications requiring 10 mm to 24 mm fastener engagement.
Install and remove sockets with the drive tool fully seated to prevent rounding or slippage. Always power down and de-energize equipment before using hand tools in proximity to electrical components. Use a torque wrench when fastener torque specifications are required by the equipment manufacturer or applicable service codes. Inspect sockets for cracks or wear before use and replace any damaged pieces.
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