Proto J4988M Hex Key Set 15 Piece

Product Description

The PROTO J4988M is a 15-piece hex key set designed for professional tradespeople who need reliable, consistent torque on hex fasteners across a wide range of applications. Hex key sets like the J4988M are standard tools in HVAC, plumbing, electrical, and general mechanical work, used to drive socket head cap screws, set screws, and other internal-hex fasteners. The set weighs 3.752 pounds, reflecting a solid, full-size construction suited to demanding job-site use. PROTO is a professional-grade hand tool brand with a long history in the trades.

The J4988M is appropriate for residential and commercial service work wherever hex-drive fasteners are encountered. Common applications include equipment installation and service, access panel fastening, motor and pump assembly work, and general mechanical maintenance. The 15-piece configuration provides coverage across a broad range of hex sizes, reducing the need to carry multiple individual keys on a job.

Key Features

• 15-piece set providing broad hex size coverage in a single kit
• Designed for professional trade use in HVAC, plumbing, electrical, and mechanical service
• Solid construction reflected in a package weight of 3.752 pounds
• Packaged as a complete set for organized storage and transport

Compatibility

Designed as a general-purpose hex key set compatible with standard internal-hex fasteners commonly found in mechanical, HVAC, plumbing, and electrical equipment.

Installation Notes

Hex key sets are used by licensed HVAC technicians, plumbers, electricians, and general mechanical tradespeople. Always de-energize electrical equipment and shut off fluid or gas supply before servicing fasteners on live systems. Select the correct key size for the fastener to avoid rounding the hex socket. Follow applicable codes such as the NEC or IFGC when performing service work on trade equipment.