Dualpurpose design: works for both internal and external applications without changing heads. Save time and avoid interruptions during repairs by switching grip orientation instead of tools. Durable carbon steel: forged from carbon steel with overall heat treatment for consistent hardness and long service life. Built to withstand demanding jobs and repeated use. Precision standard head: the precisionengineered head delivers accurate, straight performance for reliable engagement with fasteners and fittings, reducing slippage and rounding. Wide size compatibility: fits sizes from 10 mm to 40 mm, covering most nuts, bolts, and fittings used in automotive, plumbing, and general maintenance tasks. Practical benefits: reduces the number of tools required in your kit, improves workflow by eliminating head changes, and offers the strength and accuracy needed for heavyduty and routine jobs. Typical applications: Automotive : remove and install wheel hubs, axle nuts, and suspension fasteners where both internal and external grip options are needed. Plumbing and HVAC: loosen and tighten pipe fittings, couplings, and valves in tight spaces without swapping tool heads. Equipment maintenance and DIY: service lawn equipment, bicycles, and workshop machinery across a broad range of fastener sizes (10–40 mm). Materials and performance summary: Material: carbon steel with overall heat treatment for hardness and wear resistance. Function: internal and external gripping capability without head changes. Size range: 10 mm to 40 mm. Head type: standard, precisionengineered for straight, accurate operation. These pliers are a practical, durable choice when you need a single tool to handle both internal and external fasteners across a wide size range.