Starrett 56390 Combination Square Set 4 Inch 2 Piece

Product Description

The STARRETT 56390 is a 2-piece combination square set built for layout, measuring, and marking tasks in the field or shop. The set includes a 4-inch steel blade and a forged steel square head, delivering the rigidity and precision that trade professionals expect from a hand-measuring tool. The blade uses 4R graduation, marked in 1/16, 1/32, and 1/64 inch increments alongside 1/8-inch divisions, giving the user fine resolution across a compact 4-inch range. At 0.25 pounds, the set is lightweight and easy to carry to a job site. Licensed tradespeople and skilled tradespeople working in HVAC, plumbing, electrical, or general construction use this type of tool for scribing, checking squareness, and transferring measurements.

The STARRETT 56390 suits residential and light commercial trade applications where a compact, accurate layout square is needed. The 4-inch blade length makes it well suited for confined spaces and detail work. The forged steel square head locks onto the blade and provides a reliable 90-degree reference. This set is appropriate for any trade professional who needs a durable, job-site-ready measuring tool for marking cut lines, verifying square corners, or setting depth references on small workpieces.

Key Features

• 4-inch steel blade with 4R graduation in 1/64, 1/32, 1/16, and 1/8 inch increments
• Forged steel square head for durability and accurate 90-degree reference
• 2-piece set includes blade and square head
• Compact 4-inch blade length suited for detail work and confined spaces
• Lightweight at 0.25 pounds for easy carry and one-hand use

Compatibility

Designed as a standard combination square set suitable for general trade layout and measuring applications across HVAC, plumbing, electrical, and construction disciplines.

Installation Notes

No power source or shutoff is required for this hand tool. Ensure the blade is fully seated and the head lock is secure before taking a measurement to prevent slippage and inaccurate readings. Clean blade graduations regularly to maintain legibility in dusty or oily job-site conditions. Store the set protected from moisture to prevent corrosion on the steel blade and head.