Ko-ken Z-EAL 3/8" (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0" (178 mm) 3725Z — Ratchets & Wrenches product photo
Ko-ken Z-EAL 3/8" (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0" (178 mm) 3725Z — additional product viewKo-ken Z-EAL 3/8" (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0" (178 mm) 3725Z — additional product viewKo-ken Z-EAL 3/8" (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0" (178 mm) 3725Z — additional product viewKo-ken Z-EAL 3/8" (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0" (178 mm) 3725Z — additional product viewKo-ken Z-EAL 3/8" (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0" (178 mm) 3725Z — additional product viewKo-ken Z-EAL 3/8" (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0" (178 mm) 3725Z — additional product view
Ratchets & Wrenches

Ko-ken Z-EAL 3/8" (9.5 mm) SQ. Ratchet Handle, Total Length: 7.0" (178 mm) 3725Z

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The Ko-ken Z-EAL 3725Z is a 3/8-inch square drive ratchet handle from Ko-ken's Z-EAL series, precision-engineered in Japan for exceptionally low backlash, a compact head size, and high torque performance. The ratchet features a 36-tooth gear with an easy-to-grip resin handle and a patented dual-pawl, single-spring mechanism that delivers a smooth 5-degree arc swing for superior control in tight spaces. The innovative gear design increases surface-area contact within the gear, resulting in a higher torque limit while preserving Ko-ken's signature low-torque backlash performance. The fixed-head ratchet has an overall length of 7.0 inches (178 mm), a head diameter of 1.1 inches (28 mm), head thickness of 0.5 inches (13.7 mm), and weighs 8.8 oz (254 g). Suited for automotive, mechanical, industrial, and maintenance fastening where precision, access in confined spaces, and smooth ratcheting action are required. Brand: Ko-ken; Model: 3725Z; Drive Size: 3/8-inch square drive; Tooth Count: 36; Arc Swing: 5 degrees; Overall Length: 178 mm (7.0 in); Head Diameter: 28 mm (1.1 in); Head Thickness: 13.7 mm (0.5 in); Weight: 254 g (8.8 oz); Grip: resin; Mechanism: patented dual pawl with single spring; Finish: polished metal; ASIN: B005I7HVYS.

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Choosing Ratchets & Wrenches

How do I pick the right ratchet drive size?

Choose the drive size by the fastener size and torque you need — 1/4-inch for small fasteners and tight spaces, 3/8-inch for general automotive and mechanical work, and 1/2-inch for high-torque lug nuts and large bolts. A higher tooth count means a smaller swing arc, which is useful in confined areas.

When do I need a flex-head or swivel ratchet?

When fasteners sit at an angle or in recessed areas where a fixed-head ratchet cannot align. A flex or swivel head lets you keep the handle clear of obstructions while the socket stays on the fastener, improving access in tight engine bays and assemblies.