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. Key Benefits 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. Common Questions 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.
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