Q: What is a double square used for?
This small double square checks and lays out right angles, and its interchangeable rule doubles as a depth or height gauge, all from one tool.
15N0501 - Lee Valley Small Double Square

This is an excellent tool for precise layout work and machinery set-up. Made entirely from stainless steel, the square includes two 2 1/2" long rules with etched and black-filled markings for legibility.
The standard rule is graduated on one face in 32nds and 64ths. The narrow (0.2" thick) rule, with a 1/2" long probe on one end, is designed for access into confined spaces, such as when checking depth or square on hand-cut dovetail or finger-joint joinery. The knurled nut secures either rule at any position from full left to full right. All surfaces are ground and angular accuracy is to within 0.003" over the full length of the blades.
Supplied in a French-fitted leatherette storage case.
Made in Canada.
This small double square checks and lays out right angles, and its interchangeable rule doubles as a depth or height gauge, all from one tool.
Yes, the narrow 0.2" thick rule is sized to check depth or square inside confined spaces such as hand-cut dovetail or finger-joint work.
It holds angular accuracy to within 0.003" over the full length of the blades, with every surface ground to achieve that tolerance.
One rule is etched and black-filled with graduations in 32nds and 64ths, so readings stay legible and precise with repeated handling.
Yes, it's stored in a French-fitted leatherette case sized to hold the square and both rules securely.
| Materials | Stainless steel |
| Dimensions | 2 1/2" long rules (two included); narrow rule 0.2" thick |
| Includes | Small double square; graduated rule; narrow rule; leatherette storage case |
| Package Quantity | 1 item |
| Country of Origin | Canada |
| Warranty | Lee Valley Satisfaction Guarantee |

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Lee Valley Small Double Square
This is an excellent tool for precise layout work and machinery set-up. Made entirely from stainless steel, the square includes two 2 1/2" long rules with etched and black-filled markings for legibility.
The standard rule is graduated on one face in 32nds and 64ths. The narrow (0.2" thick) rule, with a 1/2" long probe on one end, is designed for access into confined spaces, such as when checking depth or square on hand-cut dovetail or finger-joint joinery. The knurled nut secures either rule at any position from full left to full right. All surfaces are ground and angular accuracy is to within 0.003" over the full length of the blades.
Supplied in a French-fitted leatherette storage case.
Made in Canada.
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