Ko-ken 3726Z-280-72T Z-Series 3/8" Sq. Dr. Flexible Ratchet, Reversible (L=280mm), 72 Tooth — Ratchets & Wrenches product photo
Ko-ken 3726Z-280-72T Z-Series 3/8" Sq. Dr. Flexible Ratchet, Reversible (L=280mm), 72 Tooth — additional product viewKo-ken 3726Z-280-72T Z-Series 3/8" Sq. Dr. Flexible Ratchet, Reversible (L=280mm), 72 Tooth — additional product view
Ratchets & Wrenches

Ko-ken 3726Z-280-72T Z-Series 3/8" Sq. Dr. Flexible Ratchet, Reversible (L=280mm), 72 Tooth

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The Ko-ken 3726Z-280-72T is a Z-Series flexible-head ratchet from Ko-ken, precision-engineered in Japan for exceptionally low backlash, a compact head profile, and high torque performance. It features a 3/8-inch square drive with a 72-tooth gear that delivers a fine 5-degree arc swing for superior control in tight, confined spaces, and a reversible mechanism that switches drive direction without removing the socket. The flexible head pivots to reach fasteners at an angle, making it ideal for automotive, mechanical, industrial, and maintenance work where clearance is limited. The ratchet has an overall length of 280 mm (approximately 11 inches), a head thickness of 13.7 mm, and is constructed from alloy steel with a blue Z-Series finish. Suited for professional mechanics and DIYers who need precision, access in confined spaces, and smooth ratcheting action. Brand: Ko-ken; Model: 3726Z-280-72T; Drive Size: 3/8-inch square drive; Tooth Count: 72; Arc Swing: 5 degrees; Head Type: Flexible (reversible); Overall Length: 280 mm; Head Thickness: 13.7 mm; Material: Alloy Steel; Finish: Blue (Z-Series); Reversible: Yes; ASIN: B07VHJN156.

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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.