Klein Tools 56316 / 70591 Key Set

Professional-grade Klein Tools 56316 (also identified as 70591) is an essential 9-piece folding hex key set engineered for the high-torque demands of HVACR and industrial mechanical work. This SAE Allen wrench set features precision-machined, square-cut hex ends that ensure a secure, full-depth engagement with fasteners, significantly reducing the risk of stripping or slippage during critical repairs. The compact folding hex key set is housed in a durable 4-1/4 inch handle, providing a comfortable grip and high leverage while remaining portable enough for a service technician's pocket or tool pouch. Constructed from heat-treated alloy steel, these keys balance hardness and ductility to resist snapping under heavy load. This portable hex key set includes nine frequently used fractional sizes: 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", and 1/4". Whether you are adjusting blower motor pulleys or servicing burner assemblies, the heavy-duty folding frame prevents individual keys from getting lost on the job site.

• Precision Fit: Square-cut ends provide maximum surface contact to prevent rounded fastener heads.
• High Leverage: The 4-1/4" handle functions as a sturdy lever, allowing for two-position key locking (straight-out or right-angle) to access tight spaces.
• Industrial Durability: Forged from heat-treated alloy steel for long-term resistance to bending and torsion.
• Organized Efficiency: Pocket-sized folding design keeps nine SAE sizes consolidated, eliminating the downtime of searching for individual loose keys.

• Does this set include metric sizes? This specific model is a dedicated SAE (fractional inch) set. For metric requirements, a separate companion set is typically required.
• Can I adjust the tension of the keys? Yes, the folding assembly is designed so that the pivot tension can be adjusted to keep keys tight or loose based on technician preference.
• Are the keys replaceable if one breaks? These are integrated into the folding handle housing to maintain a compact profile and prevent loss, making them a single consolidated unit.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.