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【Universal Compatibility】The 13mm (1/2") and 19mm (3/4") dual sockets match the standard bar nuts on most major gas chainsaws. One wrench covers both sizes — check your nut size before ordering to confirm the fit. 【Built-In Ratchet — No More Repositioning】The reversible ratchet mechanism lets you tighten or loosen bar nuts without lifting the wrench off. Flip the direction switch and keep working — even in tight spaces around chain guards and full-wrap handles. 【4-in-1 Chainsaw Multi-Tool】Bar nut wrench, spark plug socket (19mm), flat-head screwdriver for chain tensioning screws, and a tapered guide bar groove cleaner — all in one compact T-bar. Replaces four separate tools in your pouch. 【Chrome Vanadium Steel — Built for Tough Jobs】Cold-forged from Cr-V steel for high torque without flex or rounding. Handles stubborn, rusted-on bar nuts and spark plugs that cheaper stamped tools strip out on. 【Compact Enough for Your Tool Pouch】At 25 cm (9.8") and under 450g, it fits in a belt pouch, glove box, or chainsaw case. Keep one on you for quick chain adjustments and bar cleanouts in the field — no need to haul a full tool bag.