Benchmark Tools 388176 4-Inch Precision Double Square – 4R Graduations, +/-0.002” Accuracy

Overview

The Benchmark Tools 388176 4-Inch Precision Double Square is designed for precision alignment in milling, drilling, and layout tasks. Built to meet stringent accuracy standards, this tool is guaranteed to be square to within 0.002 inch over the length of the blade, making repeatable setups reliable in busy shop environments.

Solid construction and readable marks

The blade is hardened and tempered with a no-glare satin chrome finish, delivering a durable surface that resists glare under bright workshop lights. Markings are created by precision photo etching and then black filled for easy readability at a glance. Quick Reading 4R graduations show 1/64 and 1/32 on one side and 1/8 and 1/16 on the reverse, helping you read measurements quickly without squinting.

Design details you can trust

Square heads are cast and machined to a tight tolerance, with a cobalt blue color that stands out in a crowded toolbox. The locking knob holds the head firmly in place, supporting accurate transfer of references during layout tasks.

Specifications at a glance

• Blade width: 0.728 in
• Blade thickness: 0.078 in
• Blade groove: 0.86 in wide and 0.03 in deep
• Head height: 2.36 in; head width: 0.084 in; head thickness: 0.472 in
• Graduations: 4R quick reading, 1/64 and 1/32 on one side; 1/8 and 1/16 on the reverse

Usage and practicality

These squares are indispensable for setting up machinery and performing a host of shop layout tasks. They ship in a sturdy cardboard box, and spare blades and locking screws are available for extended use in demanding environments.